Why every time I send my Chesnaught into battle he is shaking left and right?

Question

none of my other pokémon does that ...

Answer 1

Did you play with it in Pokemon Amie? If so, then that is the reason.

If you have at least 2 hearts on it, it will cause it to shake, and text may be displayed.

Comments

Wow thank you,yes I play pokemon amie with my pokemon :-)

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Yeah, if you get it to a lot of hearts, good things will happen.