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. Charizard, Squirtle and Ivysaur can only be selected via the Pokémon Trainer, but each one can be faced as a standalone fighter – without Pokémon Trainer – in various areas of the game, including in numerous Spirit Board missions. This is probably why each of the three are being featured as standalone amiibo figures.
Charizard, Squirtle and Ivysaur appear as standalone fighters without Pokémon Trainer in Super Smash Bros. Ultimate