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I would really like Leafeon to have a Z move in which it plants its feet and not only recuperates it's HP and removed statuses, or increases its attack, and/or allows it to skip a charging turn.
One for Klefki in which it jingles its keys and releases a soundwave that damages and confuses the Pokémon, and raises Sp.A. Other sound based Pokémon like Noivern and Exploud have their own variations.
Bug Pokémon like Scoliopede have a shell smash of their own in which they shed their shells and boost their respective stats and add an extra 20-50 temporary HP.
Just dumb ideas, but I think they'd be funny.