you have to hit each tile once if you want to challenge the gym leader...
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beat the 8th gym
sootopilis city
...... stewen in emerald isn't a elite champion. there is wallace.
You might need to open the door to the 8th gym in Pokémon Ruby, Sapphire and Emerald. To do this you first have to awaken Rayquaza.
Petalburg city he's in the gym and you battle him for your 8th badge.