I have both and I want to complete the pokedex
Here is the list -
Mega Charizard X
Mega Mewtwo X
Source - Serebii :3
Clauncher, Aron, Lairon, xerneas, weedle, kakuna, swirlix, clawitzer, staryu, starmie, houndour, pinsir, poochyena, mightyena, and I think that's it. Hope this helps!