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Ghost/Ground Cubone & Marowak, abilities are Soundproof into Rock Head and Rattled into Unburden.
Primeape and Mankey get Gorilla Tactics and Tangled Feet (+ Outrage self-confuse hacks).
Female Teddiursas only can evolve; Ursaring becomes Fighting/Dark
Kingler gets access to Shell Smash.
Seaking becomes Water/Flying (just give Gyarados Water Dragon he's OP as fuck anyways) and gets shit like Roost, but only male Goldeen evolve.
Girafarig gets Stance Change and flips between Psychic and Dark type.
Gengar loses Poison Typing for pure Ghost but gets Shadow Tag in place of Levitate.
Magnet Pull on e.g. Magnemite line grants the effect of Magnet Rise at the start of battle.
Pidgeot and Pidgeotto lose their Normal typing but regain it with Roost.
Pelipper loses Keen Eye and gets Stuffed Cheeks alongside Drizzle.
Pinsir learns Fly, maybe Aerial Ace. Or just make Mega Pinsir's concept an evolution for it.
Venomoth becomes Poison/Psychic
Onix gets Defiant.
Ledyba and Ledian become Bug/Fairy; Comet Punch becomes a Fairy Type move with 5 guaranteed hits if used by a Fairy pokemon.
Sudowoodo and Bonsly gain 'Foliage', an ability that makes them Grass Type until they are hit by a Grass supereffective move. They revert to Rock type before damage calculation.