Ooh, statue. There’s a door in the front of it too. Head on inside. Here you’ll meet the Mega Evolution guru and once again see Korrina. Your friends will catch up as well. After much talking, it’ll be decided that you should battle your rival. Here goes! Speak with your rival when you’re ready and the battle will begin!
Rival Battle! - Pokemon Trainer Serenas/Calems Party
After defeating your rival, Korrina will finally head to the Gym, so you can now go and take her on! You still can’t head up the tower yet though as there’s still a Black Belt stopping you. When you’re ready, head to the Pokémon Center. Heal up, stock up on items and head to the Gym!