I've been wanting to make a button set like this for a very long time!! :'D It's the MC Pokemon from the Pokemon Mystery Dungeon series!
This first wave is 5 parts with four Pokemon each- so 20 buttons total! It goes through Pokemon available in Blue/Red Rescue Team and Explorers of Time/Darkness.

Part 2 is Cubone, Machop, Psyduck, and Meowth !

(these were finished sometime last year)

Set Directory:
Part 1 | Pikachu, Bulbasaur, Charmander, and Squirtle
Part 2 [You are Here] | Cubone, Machop, Psyduck, and Meowth
Part 3 | Eevee, Chikorita, Cyndaquil, and Totodile
Part 4 | Skitty, Mudkip, Torchic, and Treecko
Part 5 | Turtwig, Chimchar, Piplup, and Munchlax