Handle non-Mega form when Mega evolution is selected

[mirekdlugosz]

It seems that (some?) users expect to see details of non-Mega form when they add Mega evolution to team. That makes perfect sense, as Mega evolution is done by the player during the battle. Probably we should account for that somehow.

One way is to implicitly add non-Mega form when Mega is selected (potentially creating team with more than six members in the process). But this might be confusing, so other ideas are welcome.