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They don't feel like species, they feel like characters.
Grookey is a happy chill monkey. Scorbunny is an energetic soccer player. Sobble is a crybaby.
All species of their respective final evolutions just so happen to have the exact same interest. Rillaboom plays and carries around wooden drums, Cinderace plays soccer with fireballs, and Inteleon is a watergun spy.
Starters should feel like they belong in the wild, and these guys don't do that.