There are a total of 10 playable Pokémon fighters in Super Smash Bros. Ultimate – Pikachu, Jigglypuff, Mewtwo, Pichu, Charizard, Squirtle, Ivysaur, Greninja, Lucario and Incineroar. For handy guides featuring each playable character, click on any of the following respective links:
Super Smash Bros. Ultimate Mewtwo Guide: Mewtwo moveset, Final Smash, alternate costumes and changes
Pokémon Blog 