>>29278178The team preview sprites are the same as the ones in the Pokédex, and there's one for every form including Megas since you can choose which form the Pokédex displays by default. Plus the game needs something to fall back on if someone hacks a battle-only form into their party. Although it's technically possible there are still new Megas for things not in the Alola Dex, it's highly unlikely.
