Here's what happens:
* You earn the "Battle Frontier Champion" title. This title signifies your exceptional battle skills and your mastery over the Battle Frontier.
* You get the Frontier Pass. This pass unlocks a special room in the Battle Frontier, where you can battle the legendary Pokémon, Mewtwo. Be warned though, this battle is incredibly difficult!
* The Battle Frontier becomes more challenging. After you win all the symbols, the trainers in the Battle Frontier will become much stronger, offering an even greater challenge for skilled trainers.
It's worth noting that collecting all the symbols is no easy task. Each of the 50 symbols represents a victory in one of the Battle Frontier's 7 facilities. The Battle Frontier is designed to challenge even the most experienced trainers, and you'll need to develop strong strategies and powerful Pokémon to claim all the symbols.
Good luck on your journey to becoming the Battle Frontier Champion!