>>19266931I think it's fake because even for megas that art silhouette has WAY too much detail, and those particularly vicious looking claws on Sceptile's feet look a bit too "hardcore" for a pokemon game.
Plus, frankly, I just don't think that nintendo would even bother teasing this. They'll just hit us with the reveals in a trailer and be like "SUPPLIES! NEW MEGAS!" after.
And as other people have said, it's not actually on the twitter.