no you have to catch groudon first
He is the sootopolis city gym leader.
Sootopolis City. Check www.serebii.net for more info on Pokémon Ruby.
In Pokemon Ruby, Wallace is the gym leader of Sootopolis City. When the player first arrives in the city, Wallace is not at the gym. He and Steven are north of the city. They take the player to the Cave of Origin where Groudon is encountered. After this battle, Wallace can be found and battled in the Sootopolis Gym.
To unlock the Gym door in Sootopolis City in Pokémon Ruby, you need to first defeat the Elite Four and become the Pokémon Champion. After that, return to Sootopolis City, where you will find the Gym door will automatically unlock, allowing you to challenge the Gym Leader, Wallace. If you haven't defeated the Elite Four yet, you won't be able to access the Gym.
it is in sootopolis city which is under water it should be on your hoenn map.
Gym leaders are found in: Rustboro City Gym, Dewford Town Gym, Mauville City Gym, Lavaridge Town Gym, Petalburg City Gym, Fortree City Gym, Mossdeep City Gym, and Sootopolis City Gym
Wallace is the Gym Leader of Sootopolis City so you will be able to verse him once you challenge the Gym.
where just about always is,the sootopolis gym.
sootopolis city, after u awake rayquaza. the gym leader is juan, changed from ruby/Sapphire Wallace
You must first go through the cave of origin.
Emerald: He is the champion of the Elite Four; Juan is the Sootopolis gym leader. Sapphire/Ruby: He is the gym leader of Sootopolis.
To open Sootopolis Gym in Pokémon Omega Ruby, you need to first defeat the Elite Four and become the Pokémon Champion. After that, head to Sootopolis City, where you will find the gym entrance blocked by a large body of water. You must complete the storyline involving the Legendary Pokémon Kyogre and Groudon, after which the water will recede, allowing you to enter the gym and challenge its leader, Wallace.