first each member picks 3 of what you see to replace one of your normal prices (ex: rook, knight, and pawn. then you would swap any normal rook knight and pawn for a MEGA one.) it can be the same ones if one is chosen by both.
then each member would secretly pick any tile on the board, and if a MEGA lands on it, then it becomes ultimate. each ultimate will have their move lists on their art page. at least soon they will