What about special berries of the strarter pokemon that gives them plus two points for one attack or 5 hp points but you can only use ten of them on them.
Bulba berry

(use only on Bulbasaur and evolutions)
Char berry

(use only on Charmander and evolutions)
Squirt berry

(use only on Squirtle)
Pika berry

(use only on Pikachu and evolutions)
Eev berry

(use only on Eevee and evolutions)
Chika berry

(use only on Chikarita and evolutions)
Cynda berry

(use only on Cyndaquil and evolutions)
Toto berry

(use only on Totodile and evolutions)
Tree berry

(use only on Treecko and evolutions)
Torch berry

(use only on Torchic and evolutions)
Mud berry

(use only on Mudkip and evolutions)