I found a team with an Immortal and a Gladiator Dragon in the Primal 2 Arena, even though you can't use dragons with that element in that arena. Not to mention they were powered up in the battle. I think I encountered someone from the Legend Arena. Is this supposed to happen?

@dangerchicken212 Often, short before we reach the next stage, we get opponents who are already in the next stage. So they can use other dragons.