Hello and welcome. I am the Chairman and Creator for the Magma Battle Frontier. I hope you enjoy it. Now, this is what you need to know when battling another Trainer;
All levels are the same level as the highest level in your party. For example, say you entered the Battle Pyramid with these Pokémon;
Then, all opposing trainers' Pokémon are level 8. Now, I realize this may be difficult to work with here, so, all your other Pokémon get elevated to suit. So your team now would be;
However, they don't stay increased outside of the Battle Frontier.
You may not use items in any challenge (except Artisan Cave and Battle Pyramid.) Held items however, may be used.