I know these topics got used a lot already but many pokemon just dont have the stats, movepool, typing or ability to be good. List pokemon you really want to have an evo, how that evo would look, typing etc. I will start:
Mawile evo: Evolve at lvl 30 if Female: Steel/Psychic Two smaller plant head things, high attack and speed. Evolve at lvl 35 if Male: Steel/Fight One very big plant head, high attack and def.
Druddigon evo: Dragon/Stone, evolve at lvl 40 Gargoyle Pokemon
Fearow evo : Flying/Fighting It looks like a heroic bird and it basically turned from a tyrant to a protector.
I was lazy with new moves, abilities and stats, but feel free to add them.