Basically a Bulbasaur clone. Its design would be the traditional cocoon-bug design, however, its body would be symbiotically bound by its grass, much like Bulbasaur and Turtwig. Starting as standard weed, it would grow up into a flower bug cocoon, and get out like a butterfly insect.
Its hidden ability would be Chlorophyll. Its egg Group would be Grass/Bug.
Starting off as a humanoid weed, this Pokémon would eventually gain a mask with tribal patterns, and later gaining a cape to hide its back. It would be essentially be psychedelic weed shaman.
Its hidden ability would be Synchronize. Its egg Group would be Grass/Human-Like.
Starting as a standard pixie with leaf wings, it would grow first into a butterfly-like form, and then gain a fruit crown in its final form. It would be a grass royalty, but a queen like Tsareena, not a king like Serperior.
Its hidden ability would be Dazzling. Its egg Group would be Grass/Fairy.
An odd fish-like design, it would grow more and more and vicious each stage. Its first form would look like a mud-fish made of wines, and its final form would look like a deep sea fish, but with bright coloring. It would swim on grassy patches instead of water.
Its hidden ability would be a Grass variant of Surge Surfer. Its egg Group would be Grass/Water 2.
This Pokémon would start off as a conventional nut, but as it would grow its leaves would sharpen and become reflective, which it would use to polish is nut body. Eventually, it would harden to point of using actual steel in its body, which would also be useful in photosynthesis.
Its hidden ability would be Solar Power. Its egg Group would be Grass/Mineral.
This Pokémon would start off similar to Popplio with each successive stage being more humanoid than the last one. Its final form would get access to other pulse moves.
Its hidden ability would be Inner Focus.
Based off a sea snake. It would become more reptilian as it evolves.
Its hidden ability would be Strong Jaw.
Similar to Water/Psychic, this line would grow more humanoid, fully becoming a shaman.
Its hidden ability would be Cursed Body.
Standard cocoon to moth evolution, but this time around, the cocoon is made of crystals and mud, and the moth has rock wings.
Egg Group, Bug/Mineral. Abilities would be Solid Rock/Shield Dust/Wonder Skin
Standard cocoon to moth evolution, but this time around, the cocoon is made of brass, and the insect wings are made of brass.
Egg Group, Bug/Mineral. Abilities would be Heavy Metal/Shield Dust/Clear Body.
Standard cocoon to moth evolution, but this time around, the cocoon is made of coal fire, and the insect wings are burning.
Egg Group, Bug. Abilities would be Flame Body/Shield Dust/Flash Fire.
A muddy tadpole that swims in mud that evolves into a frog covered in mud. Its body would have patterns of earth cracking.
Egg Group: Water I. Abilities would be Sand Veil/Storm Drain/Overcoat.
Standard ghost, its body would be a plump of Water possessed by a sprite. Its evolution would be same plum of water, but with limbs made of hydro pumps.
Egg Group, Amorphous/Water1. Abilities would be Cursed Body/Swift Swim/Water Absorb.
A random snake that upon evolution gains atavistic legs. It would also have volcanic breath.
Egg Group: Dragon/Field. Abilities would be Shed Skin/Infiltrator/Berserker.
A standard dragon that breathes electrical beams instead of fire, using moves like Charge Beam and Electro Ball. Upon using attacks it would light up.
Egg Group: Dragon/Monster. Abilities would be Lightningrod/Illuminate/Competitive.
A raptor with psychedelic colors. Upon evolution, it body markings would more closely like geometric patterns.
Egg Group: Dragon/Human-Like. Abilities would be Telepathy/Synchronize/Magician.
A wyrm that digs through snow, which upon evolution gains massive horns. It attacks by slamming its frozen tail.
Egg Group: Dragon. Abilities would be Snow Cloak/Defiant/Ice Body.
Rock: A rock cannon that gets Skill Link. Initially it would get Bullet Seed, but after evolving, it would also have Icicle Spear.
Egg Group: Mineral, its alternate ability would be Sniper.
Rock/Dark: A giant fanged statue that evolves from a stone mask. Its ability would be Strong Jaw and Intimidate.
Egg Group: Mineral.