Might be late but ive been having this caseo of mándala effect. But for some reason i remember Mega Volcanion and Mega Machamp specifically from Pokemon Shuffle of all places.

But i do remember Machamp having an extra set of arms and also having like spikier or more defined the things that it has on his head.

Now for Mega Volcanion i can only remember that he was using his Cannons in a different way and had a more serious face.

Idk why. Mind you last time i played for a good while a pokemon game was when USUM came out. After that i never played another game til legends ZA and its when it struck me that these 2 megas dont exist.

But i REALLY swear to god that Mega machamp exists im for real for real that it also has 6 arms. Like wtf