As we need to do so.
Let's first discuss each type individually. Starting with;
Common coverage moves obtained by this type are: Thunderbolt, Thunder, Flamethrower, Fire Blast, Ice Beam, Blizzard, Focus Blast, Rock Smash, Play Rough, Sucker Punch, Reversal, Hammer Arm.
Common coverage moves other types can obtain are: Return, Frustration, Hyper Voice.
Normal-type generally has the largest coverage moves, as Normal type does not have any offensive advantage besides STAB bonus. However, certain Normal-types such as Flying Pokémon, as well as some gimmick Pokémon such as Castform do not have large coverage moves. In addition, many Normal-types lack proper STAB for their own type, such as access to Body Slam and Double-Edge.
This further extends to the coverage moves, as there is no universal coverage move for Normal-types. Certain Pokémon might get Thunderbolt, others might get Flamethrower, and many others get Shadow Ball.
It is possible that in the future Normal-type might have a dedicated coverage type, such as Fairy, Dark or Ghost, but as things stand, Normal-type is too complex to properly reorganize.
Fire types' coverage moves tend to come in some categories:
1."Volcanic" Pokémon: These are species such as Torkoal, Volcanion, Heatran etc. which get access to Ground, Rock and Steel type moves even if they are not part Rock or Ground like Magcargo and Camerupt.These have the widest coverage of any Fire-types.
2.Regular Fire-types: Species such as Ninetales and Flareon only have their respective coverage moves with little to no overlap.
3. Bipedal Fire-types: These tend to have access to weak or powerful but inaccurate Fighting moves.
4. Solar Beam: Exclusive to final stages.
5.Bestial Fire-types: Which get Wild Charge.
There are clearly issues in this overall scheme. There are too many subgroups in the type to discuss efficiently, and there is a clear bias towards STAB moves and final evolutions when it comes to coverage moves.
One possible way to fix this type would be giving it Solar Beam at all stages. Outside of that, each individual subgroup can get more moves of their tendency. Bipedal moves can have wider Fighting moves, Volcanic Pokémon can have more Steel and Ground moves, and regular species can have more moves of their type affinity.
Outside of this, the line can get more moves related to Sun such as Morning Sun or light, such as Dazzling Gleam, Flash Cannon, and Power Gem. Outside of this, more species can get generic coverage moves such as Grass Knot, Iron Tail, Crunch and Dark Pulse. And most importantly, the type itself can get two of its common coverage moves, Wild Charge and Energy Ball, as type specific coverage moves.
Common coverage moves obtained by this type are: Thunderbolt,
Thunder, Energy Ball, Dark Pulse, Shadow Ball, Focus Blast, Fire Punch, Thunder Punch, Ice Punch, Charge Beam, Dazzling Gleam, Grass Knot
Common coverage moves other types can obtain are: Psychic, Psyshock, Zen Headbutt
Psychic-type has little to no issues in coverage moves or distribution of their own moves. Psychic-types' coverage moves are generally shared by all members of the type, or at least all members of the type that share the body type.
Human-Like Pokémon are in particular common in this type, which gives the type a lot of options. Most notably however, are the elemental Punches, which were originally given to this type because they were Special moves. However, as they are no longer Special moves, no compensation for them has been given.
Most of the Psychic-types needs can be listed in below:
-A reliable Special Fighting type move. Aura Sphere is commonly recommended, due to type's association with aura.
-More physical moves are needed. While most physical Psychic-types get Elemental punches, there is no dedicated physical move for the type outside of them.
-Most notably however, the lines' existing moves can be given to wider array of species. Dazzling Gleam and Dark Pulse in particular can get more Psychic mons.
Common coverage moves obtained by this type are: Psyshock, Psychic, Thunderbolt, Thunder, Charge Beam, Shadow Ball, Grass Knot, Energy Ball, Signal Beam, Dream Eater, Drain Punch, Fire Punch, Ice Punch, Thunder Punch, Hyper Voice, Uproar, Covet, Thief, Shock Wave, Water Pulse, Last Resort
Common coverage moves other types can obtain are: Moonblast, Dazzling Gleam, Play Rough, Draining Kiss, Disarming Voice
While Fairy-types have a lot of types under their disposal, their primary concern lies with the fact that their types are generally geared towards Special Moves. This is the primary hurdle for Fairy-types.
Similarly, outside of Dazzling Gleam, there is no Fairy-type move that is given through TMs or Move Tutors, particularly, no physical move. However, Play Rough has wide distribution which lowers the tension a bit.
Best route for Fairy-types to go is to get more Physical moves from the types they are associated with, Grass, Psychic and Normal.
Common coverage moves obtained by this type are: Signal Beam, Flash Cannon, Water Pulse, Surf, Payback, Psychic, Iron Head, Rock Slide, Rock Tomb.
Common coverage moves other types can obtain are: Ice Beam, Blizzard, Ice Fang, Ice Punch. Formerly Avalanche.
Outside of Water Pulse and Signal Beam, Ice-type does not have any serious coverage moves, but all Ice-types have some coverage options.
To fix this, some of the common coverage moves should be made more common, such as Psychic and Flash Cannon, and the connection between Steel, Rock and Psychic-types should be well established.
Outside of that, more Physical Ice-type moves should be introduced, and Aurora Beam, a mid-game move, should be made more common, as well as Ice Ball, probably.
Common coverage moves obtained by this type are: Sludge Bomb, Dazzling Gleam, X-Scissor, Knock Off, Natural Gift, Nature Power, Aerial Ace, Shadow Ball, Iron Tail, Payback, Rock Tomb, Earthquake, Poison Jab. Formerly Fury Cutter.
Common coverage moves other types can obtain are: Giga Drain, Solar Beam, Energy Ball, Grass Knot, Seed Bomb. Formerly Bullet Seed and Mega Drain.
Grass-type only has two major types it is associated with, Poison and Fairy, as well as everpresent Aerial Ace.
To fix this, Grass-types can get more slashing moves such as Night Slash, Psycho Cut, and X-Scissor. Grass-types can also get Earth Power as some species get it as a coverage.
On the opposite end of spectrum, Grass-type needs a bit more Physical Grass-moves as common coverage moves.
Common coverage moves obtained by this type are: Signal Beam, Icy Wind, Ice Beam, Blizzard, Ice Punch, Sludge Bomb, Sludge Wave, Grass Knot, Iron Tail, Knock Off, U-turn, Thief, Crunch, Bite, Bounce, Ice Fang. Formerly Avalanche.
Common coverage moves other types can obtain are: Surf, Water Pulse, Aqua Tail. Formerly Bubble Beam Whirlpool and Water Gun.
Water-type has one single dedicated coverage type, Ice. That basically makes it a great type, as Ice-type is one of the best offensive types in the game.
Outside of this, Water-type has minor connection with Dark and Poison-types, and has several common coverage moves.
Overall, outside of a common Physical move for Water-type, and more direct connection with Poison, particularly a wider distribution of Sludge Wave and Poison Fang, I can't see much improvements. But I would like to see people's suggestion.
Common coverage moves obtained by this type are: Thief, Steel Wing, Heat Wave, U-turn, Natural Gift. Formerly Silver Wind, Mud-Slap, Twister, Ominous Wind.
Common coverage moves other types can obtain are: Fly, Aerial Ace, Acrobatics, Bounce. Formerly Air Cutter.
When it comes to getting or giving coverage moves, Flying-type is hilariously bad. Most of the moves obtained by the type are either common early moves such as Thief or Twister, unreliable and powerless like Steel Wing and Natural Gift, or just mediocre, like Heat Wave.
Some Flying-types have another type that grants them coverage moves, such as Dragon, Bug, and Water, but most others don't. Normal-typing is pretty much wasted on Normal/Flying Pokémon.
In addition to this, most of the Flying moves are purposefully designed to be used for Flying or Bird Pokémon, both of which do not provide a lot of type variety.
Best way to fix this type is to give it more moves. Some Flying-types get Icy Wind as a coverage move, and this idea can be given to many Flying-types, perhaps expanded to all common Ice-type moves like how Water-types get them. Dragon Rush is also available to some draconic Flying-types, which can be expanded to more Pokémon.
Outside of this, existing moves such as Acrobatics must expand their horizon. But also Special Flying moves such as Air Cutter, Air Slash and Hurricane must be made available for TMs and Move Tutors.
Outside of that Steel Wing must be buffed significantly. And more wind moves, perhaps upgrades to Flying-types' former coverage moves must be introduced.
Individual species must also expand their horizons. Normal/Flying Pokémon must get more Normal moves and moves expected of Normal-types such as almost all elemental beams, and perhaps species with talons should get Slashing moves, just like how Braviary gets Shadow Claw.
Common coverage moves obtained by this type are: Iron Head, Iron Tail, Gyro Ball, Flash Cannon, Earthquake, Dig, Earth Power, Superpower, Elemental Punches, Shock Wave, Rock Smash, Nature Power, Explosion, Payback. Formerly Sucker Punch.
Common coverage moves other types can obtain are: Smack Down, Stone Edge, Rock Slide, Rock Tomb. Formerly Rollout, Ancient Power.
Rock-types are interesting in the sense that they have three main coverage types, Steel, Ground and Fighting. This quartet forms the "Earth" elements, and all three members gain moves from each other.
Rock-types, however, have limited association with three other types, Dragon, Dark and Electric. This association can be furthered in the upcoming future, particularly by the introduction of more Dragon, Dark and Electric-types that are part Rock.
Biggest failure of Rock-type however is its inability to have a proper special Rock-type move. This has been the bane of this type since Generation IV, and has not been fixed for 10 years.
Common coverage moves obtained by this type are: Sucker Punch, Brick Break, Crunch, Bite, Thunder Fang, Ice Fang, Fire Fang, Stone Edge, Rock Slide, Rock Tomb, Iron Tail, Iron Head, Flash Cannon, Superpower, Sludge Bomb, Poison Jab, Sludge Wave.
Common coverage moves other types can obtain are: Earthquake, Bulldoze, Mud Shot, Drill Run, Dig. Earth Power. Formerly Mud-Slap.
As the primary Earth type, Ground-types do not face a lot issues with coverage moves. With several dedicated coverage types, it will never lose out.
This type's greatest sin is its focus on Physical moves. Because of this, there are not a lot of dedicated Special coverage moves for this type or from this type to others.
While some species do need more moves, such as Hippopotas, otherwise, Ground-type is a fairly successful type.
Common coverage moves obtained by this type are: Ice Beam, Blizzard, Thunderbolt, Thunder, Fire Blast, Incinerate, Flamethrower, Surf, Hydro Pump, Crunch, Iron Head, Superpower, Water Pulse, Earthquake, Thunder Fang, Ice Fang, Bite.
Common coverage moves other types can obtain are: Dual Chop, Outrage, Dragon Pulse, Dragon Tail, Dragon Claw. Formerly Twister, Dragon Rage and Dragon Breath.
As one of the non-elemental types, Dragons get access to a lot of moves, predominantly Water, Electric and Fire. Dragon-types also get a lot of high-end moves such as Earthquake, Superpower and Focus Blast.
With these in-mind, the biggest issue facing Dragon-type is its lack of other elemental combinations. And, lack of diverse coverage moves, particularly Special ones.
Common coverage moves obtained by this type are: Volt Switch, Thunderbolt, Thunder, Shock Wave, Rock Slide, Rock Tomb, Rock Smash, Earthquake, Earth Power, Stone Edge, Payback, Wild Charge, Bulldoze, Dig, Drill Run. Formerly Rollout.
Common coverage moves other types can obtain are:Heavy Slam, Iron Head, Iron Tail, Steel Wing, Gyro Ball, Flash Cannon, Bullet Punch.
Steel-type is one of the Earth elements, but unlike others, rather than having an affinity with Fighting, this type has affinity with Electric and Dark. In addition, while a lot of Steel-types get Rock moves, comparatively less get Ground moves.
These two issues can be fixed, and the line can get more physical Electric-type moves such as Thunder Punch, but ignoring these, the type's greatest issue is lack of a powerful and common coverage move. Iron Tail and Steel Wing are complete jokes.
Common coverage moves obtained by this type are: Fire Punch, Grass Knot, Ice Punch, Thunder Punch, Earthquake, Smack Down, Rock Tomb, Stone Edge, Dig, Payback, Knock Off, Bullet Punch, Dual Chop. Formerly Mega Kick, Mega Punch, Sucker Punch, Poison Jab, Aerial Ace, Zen Headbutt.
Common coverage moves other types can obtain are: Brick Break, Close Combat, Drain Punch, Focus Blast, Low Kick, Low Sweep, Power-Up Punch, Rock Smash, Superpower, Double Kick, Cross Chop, Revenge. Formerly Dynamic Punch, Vacuum Wave, Counter, Submission.
Probably the most well-developed type, yet most poorly recognized one as well, Fighting-type's greatest is its heavy emphasis on Physical attackers, which makes the Special options for this type and from this type very poor.
Outside of that, type's low association with Steel, Dark and Psychic can be expanded, and the moves some Fighting-types got, Zen Headbutt and Dragon Claw, can see more hands. More Acrobatics users would be swell as well.
Common coverage moves obtained by this type are: Signal Beam, Dazzling Gleam, Grass Knot, Iron Tail, Dig, Covet, Thief, Shadow Ball, Uproar, Crunch, Elemental Punches, Brick Break, Elemental Fangs, Focus Punch, Focus Blast. In some cases, Overheat.
Common coverage moves other types can obtain are: Thunderbolt, Thunder, Thunder Punch, Wild Charge, Charge Beam, Shock Wave, Volt Switch. Formerly Zap Cannon.
Electric-type has one deterministic coverage move, Signal Beam. Everything else is dependent on the given species, even if there are commonalities within those species.
This is atrocious. Electric is one of the primary types, it needs several coverage moves.
One possibility is to give access to Flash Cannon, Dazzling Gleam, and Shadow Ball to wider species. As well as possibly Hyper Voice and Shadow Ball as well.
Outside of this, there needs to be wider Physical moves for Electric-types. Play Rough would be thematically fitting, but a buff to Iron Tail would be the best. More Dark-type moves such as Assurance and Punishment, as well as more association with Fire moves such as Flare Blitz would work really well.
Common coverage moves obtained by this type are: Incinerate, U-turn, Shadow Claw, Shadow Ball, Dream Eater, Covet, Uproar, Iron Tail, Hyper Voice, Sludge Bomb, Icy Wind, X-Scissor, Poison Jab, Aerial Ace. Formerly Fury Cutter.
Common coverage moves other types can obtain are: Snarl, Dark Pulse, Payback, Bite, Crunch, Night Slash, Thief, Knock Off, Fling, Assurance.
Outside of Ghost-type, which it is too similar to, Dark-type doesn't have a true coverage type. While a lot of individual species get Poison, Bug, Normal and Fire type moves, there really isn't a single deterministic type that is commonly given to Dark-types besides Ghost.
In addition, a lot of the coverage moves listed here are either too situational, like Dream Eater, too weak like Icy Wind and Incinerate, or are too rare, like Sludge Bomb, Poison Jab and Icy Wind.
To fix this, Dark-types' association with Poison and Fire types should intensify, with more Pokémon getting powerful Fire and Poison moves. In addition, some of the rarer coverage moves such as Icy Wind and Gunk Shot should see more distribution. In addition, Dark-type's non-elemental and paranormal status should be improved, and Dark-type should be put in a similar non-elemental situation like its fellow Psychic and Ghost types.
As Dark-type is a very common coverage type, it doesn't need improvement in that department.
Common coverage moves obtained by this type are: Psychic, Zen Headbutt, Shadow Ball, Shadow Claw, Acrobatics, Aerial Ace, Energy Ball, Solar Beam, Sludge Bomb, Poison Jab, Thief, Knock Off, Pursuit, Air Slash.
Common coverage moves other types can obtain are: Signal Beam, U-turn, X-Scissor, Megahorn. Formerly Silver Wind and Fury Cutter.
Biggest flaw of Bug-type is, outside of its species' weaknesses, is the fact it has no major Special Bug move that is made available to a large variety of Pokémon. Outside of that, Bug-type can be improved, but it is overall good.
There other quirks of Bug-type, for example, some species get Steel Wing while others don't, despite having wings. This can be fixed.
Several species of Bugs also have tails that serve little purpose, which can also be fixed.
Outside of that, more Bug-types can learn Dark Pulse, given type's affinity with Dark.
Common coverage moves obtained by this type are: Giga Drain, Foul Play, Flamethrower, Fire Blast, Incinerate, Shadow Ball, Explosion, Mud Bomb, Mud Shot, Pursuit, Thief, Solar Beam, Dark Pulse, Payback. Formerly Sucker Punch.
Common coverage moves other types can obtain are: Acid Spray, Acid, Sludge Bomb, Sludge Wave, Poison Jab, Gunk Shot, Belch, Clear Smog, Poison Tail, Venoshock, Smog.
Poison-type is one of the types that have a dedicated coverage type, which is Dark. With Dark-type moves, Poison-type gets the coverage it needs.
However, the biggest obstacle on Poison-types is the lack of coverage moves on individual species, and lack of powerful moves in general. To fix this, Poison can get more moves from its lesser coverage types, Fire, Ground, Ghost and Grass. Outside of this, more powerful Special Poison-types might be necessary, as Belch is not easy to use.
Common coverage moves obtained by this type are: Psychic, Giga Drain, Knock Off, Dark Pulse, Ice Punch, Fire Punch, Thunder Punch, Thunderbolt, Thunder, Charge Beam, Thief, Shock Wave, Water Pulse, Dream Eater, Energy Ball, Pursuit, Dazzling Gleam, Feint Attack. Formerly Sucker Punch.
Common coverage moves other types can obtain are: Shadow Ball, Shadow Sneak, Shadow Claw, Hex. Formerly Ominous Wind.
In terms of coverage, Ghost-type is effectively a combination of Psychic and Dark-types. This gives the type a variety of moves to choose from, but sadly the similarity of the Ghost-types to each other has caused the type to decline a bit.
In addition, though some Ghost-types get Poison and Fire moves, not all members do, which can be expanded.
Ignoring this, Ghost-type also lacks strong moves, even though existing moves have nice side-effects that can ruin the opponent.