Why is it that people use things like megaevo and terastelization and stuff like that once a battle? I get if it’s a rule in a championship game or something but if someone with a megastone for all their pokemon were to…idk rob a bank or something, why don’t they just do that? or have I not seen enough banks being robbed?
it's mostly because these are incredibly energy intense processes. with terastallization, a tera orb actually has to be recharged in between uses, because it can only hold so much energy at a time. even if you wanted to terastallize more than once in a battle, you'd have no way to do that without stopping the battle to recharge.
mega evolution can theoretically be done more than once in an extended battle, but doing so is very hard on both pokemon and trainer. restricting mega evolution to once per battle is a matter of safety. a keystone can only trigger one mega evolution at once, so sorry to any potential bank robbers thinking about giving that a shot!
