In my experience, there's been Charizard, Blastoise, Venasaur, Blaziken... Absol, Lucario, Gyarados, Aerodactyl, Abomasnow, Ampharos, Gengar, and Gardevoir. But there's a ton more yet to be discovered! Those are just the stones I've found, bought, and been given in Kalos so far. I've used quite a few in battle myself.

[C'est magnifique, isn't it. Ah, that's right, he needs to be looking for his bracelet too. That's priority right now. Then the stones.]