Inspired by Zarel's Gen-Next proposal, I decided to do my take on the idea of intrinsic Ground immunity replacing Levitate. Unlike Zarel's more modest proposal, I'm actually going full way with this, with giving all Levitate users full three abilities, and Legendaries one ability and one HA.
Gastly-Haunter-Gengar:
New Main Abilities: Cursed Body, Insomnia
New Hidden Ability: Shadow Tag
Koffing-Weezing:
New Main Abilities: Aftermath, Stench
New Hidden Ability: Flare Boost
Misdreavus-Mismagius:
New Main Abilities: Cursed Body, Insomnia
New Hidden Ability: Magic Bounce
Unown:
New Main Abilities: Telepathy, Synchronize
New Hidden Ability: Protean
Vibrava-Flygon:
Based on Trapinch's Hyper Cutter, Arena Trap, Sheer Force
New Main Abilities: Tinted Lens, Arena Trap
New Hidden Ability: Sheer Force
Lunatone-Solrock:
New Main Abilities: Synchronize, Magic Guard,
New Hidden Ability(Solrock): Drought
New Hidden Ability(Lunatone): Snow Warning
Baltoy-Claydol:
New Main Ability: Magic Guard, Synchronize
New Hidden Ability: Magic Bounce
Duskull:
New Main Ability: Pressure
Chimecho- Chingling:
New Main Abilities: Synchronize, Magic Guard
New Hidden Ability: Healer
Latias-Latios:
New Main Ability: Synchronize
New Hidden Ability: Telepathy
New Mega Ability: Magic Bounce
Bronzor-Bronzong:
New Main Ability: Clear Body
Carnivine:
New Main Abilities: Leaf Guard, Chlorophyll
New Hidden Ability: Gluttony
Rotom:
New Main Abilities: Motor Drive, Static
New Hidden Ability: Lightningrod
Uxie-Azelf-Mesprit:
New Main Ability: Synchronize
New Hidden Ability(Uxie): Forewarn(JP. Name Prophetic Dream)
New Hidden Ability(Mesprit): Telepathy
New Hidden Ability(Azelf): Inner Focus (JP. Name: Force of Will)
Giratina Origin Forme:
Based off regular Giratina;
New Main Ability: Pressure
New Hidden Ability: Telepathy
Cresselia:
New Main Ability: Synchronize
New Hidden Ability: Magic Bounce
Tynamo-Eelektross-Eelektrik:
New Main Abilities: Static, Volt Absorb
New Hidden Ability: Swift Swim
Cryogonal:
New Main Abilities: Ice Body, Clear Body
New Hidden Ability: Snow Warning
Hydreigon:
New Main Ability: Moxie
Though I must say that I'm surprised with the fact that they didn't announce any new Pokémon with Levitate, besides the Lati duo. I wouldn't be surprised if the Flygon Mega ends up phasing out Levitate for something else like Gengar did.
Note(17.02.2018): Gengar no longer has Levitate, instead has Cursed Body.
Note (02.01.2020): Koffing and Weezing now both have full three Abilities in addition to Levitate.
Gastly-Haunter-Gengar:
New Main Abilities: Cursed Body, Insomnia
New Hidden Ability: Shadow Tag
Koffing-Weezing:
New Main Abilities: Aftermath, Stench
New Hidden Ability: Flare Boost
Misdreavus-Mismagius:
New Main Abilities: Cursed Body, Insomnia
New Hidden Ability: Magic Bounce
Unown:
New Main Abilities: Telepathy, Synchronize
New Hidden Ability: Protean
Vibrava-Flygon:
Based on Trapinch's Hyper Cutter, Arena Trap, Sheer Force
New Main Abilities: Tinted Lens, Arena Trap
New Hidden Ability: Sheer Force
Lunatone-Solrock:
New Main Abilities: Synchronize, Magic Guard,
New Hidden Ability(Solrock): Drought
New Hidden Ability(Lunatone): Snow Warning
Baltoy-Claydol:
New Main Ability: Magic Guard, Synchronize
New Hidden Ability: Magic Bounce
Duskull:
New Main Ability: Pressure
Chimecho- Chingling:
New Main Abilities: Synchronize, Magic Guard
New Hidden Ability: Healer
Latias-Latios:
New Main Ability: Synchronize
New Hidden Ability: Telepathy
New Mega Ability: Magic Bounce
Bronzor-Bronzong:
New Main Ability: Clear Body
Carnivine:
New Main Abilities: Leaf Guard, Chlorophyll
New Hidden Ability: Gluttony
Rotom:
New Main Abilities: Motor Drive, Static
New Hidden Ability: Lightningrod
Uxie-Azelf-Mesprit:
New Main Ability: Synchronize
New Hidden Ability(Uxie): Forewarn(JP. Name Prophetic Dream)
New Hidden Ability(Mesprit): Telepathy
New Hidden Ability(Azelf): Inner Focus (JP. Name: Force of Will)
Giratina Origin Forme:
Based off regular Giratina;
New Main Ability: Pressure
New Hidden Ability: Telepathy
Cresselia:
New Main Ability: Synchronize
New Hidden Ability: Magic Bounce
Tynamo-Eelektross-Eelektrik:
New Main Abilities: Static, Volt Absorb
New Hidden Ability: Swift Swim
Cryogonal:
New Main Abilities: Ice Body, Clear Body
New Hidden Ability: Snow Warning
Hydreigon:
New Main Ability: Moxie
Though I must say that I'm surprised with the fact that they didn't announce any new Pokémon with Levitate, besides the Lati duo. I wouldn't be surprised if the Flygon Mega ends up phasing out Levitate for something else like Gengar did.
Note(17.02.2018): Gengar no longer has Levitate, instead has Cursed Body.
Note (02.01.2020): Koffing and Weezing now both have full three Abilities in addition to Levitate.