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Back to Route 229
Heal your Pokémon before proceeding. You'll need to bring Pokémon with Surf and Rock Smash.
Explore the area with long grass if you didn't do so. Otherwise, continue west to Route 230.
Back in Fight Area
Make sure that you heal your Pokémon and have them at or above Lv.60 before proceeding!
Every weekend (Saturday and Sunday), Rival Barry will stop his training in Stark Mountain and wait for you in front of the gate to the Battle Park. Talk to him when you're prepared, and he'll ask for a rematch. Get ready for a fierce battle!
His team is now far stronger than the fight in Pokémon League Main Building. With his Pokémon around Lv.60 and his starter Pokémon at Lv.64, this rematch can be as tough as the battle with Champion Cynthia!
The hardest challenge!
If you defeat the Elite Four and Champion 20 times, Barry's Pokémon will each increase in level by 10, and his prize money upon being defeated will increase to 7,400. His Pokémon will also know many new powerful moves. This will be the most difficult fight in the whole game, even harder than the Champion battle. Don't you dare to fight him unless you have your Pokémon at around Lv.70!
Congratulations! You have completed the after game storyline!
There are still some things for you to do, though. Look at your Trainer Card. You can actually get more Trainer stars! You can aim for defeating Trainers in Battle Tower 100 times in a row, winning a Master Rank in a Super Contest and try to get a platinum flag in the Underground. But don't forget about the biggest aim— catching all Pokémon and completing the Pokedex! Finishing these four jobs will give you the four remaining stars.
Players! It's time to get all 5 trainer stars and complete your game! These are difficult jobs for sure, but with determination, you'll ultimately succeed!