I LOVE MONSTER COLLECTORS RAHHHHHHHHH
My advice would be nothing they’re already perfect lol, but if you want advice then if you go for three stages evoloutions or fusions prelude to the growth e.g. Pikachu doesn’t really foreshadow Raichu’s tail change, however something like Komasan and Komane is a natural evoloution. This is really good but I can’t give any more advice. Maybe make it so after they repeat their idle long enough the do something different, like how they might do a certain dance 3 times and then stop in place and roar. You know what I meant, I hope at least lol