I'm gonna be on the real with you. You need to dust off Super Mario Maker (I know, sometimes it loses its luster after you've played it every single day) and download the latest set of additional content that's been added to the game.
You can now get the original starter Pokémon (Charmander, Squirtle, and Bulbasaur for you whippersnappers) in-game for your platforming pleasure. You'll have to complete a special Pokémon-themed course in order to catch 'em all, but once you do all three will be available for you to play as or sprinkle throughout your level.
Excuse me while I go get my starter on.
Brittany Vincent posted a new article, Pokemon Are Rolling All Up Into Super Mario Maker