Haven't got a reply from Ape
I wasn't using a mega Gengar
Alright got it"Pokemon with access to a Mega-Evolution cost 100 extra BST."
"In games 1, 2, 4, and 5 of aqh vs The Thunderbirds, the latter brought a team bypassing the BST limit. Aqh wins 3-0, and I'm going to reclarify this. If a Pokemon has access to a Mega Stone (even if it isn't holding it) it costs an additional 100 BST. "