The Sootopolis City Gym is the eighth Gym in the Hoenn region, and the last one the player must defeat before challenging the Pokemon League. The Sootopolis Gym specializes in Water type Pokemon, and once defeated the player will be awarded with the Rain Badge. The Sootopolis City Gym is located in the center of the city. In Ruby, Sapphire, Omega Ruby, and Alpha Sapphire, the Gym leader you will face is Wallace. However, if you challenge the Gym in Emerald, you must face leader Juan instead. Juan takes over the Gym in Emerald, because Wallace moves up to the title of Pokemon League Champion. In Ruby, Sapphire, and Emerald, the player will receive the move Water Pulse for defeating the Leader. In Omega Ruby/Alpha Sapphire, they will receive the move Waterfall instead.
Though the Gym is based around Water types, the Gym itself requires the player to navigate around ice tiles. The player must step on each and every tile of ice (without stepping on one more than once) in order to activate the stairs to the next level. If the player fails, they will fall through the ice and land where the Gym trainers are located. If the player falls, they must face a Gym trainer before they can resume trying to reach the Leader. Below I will link two videos that show the solution to getting through the Gym.
The Gym trainers you may encounter all have Water type Pokemon. Some of them may be dual type, however. So you should expect some Water/Dark and Water/Grass types to be thrown in as well. Wallace and Juan follow this trend, and have a combination of Water, Water/Ground, Ice/Water, Water/Dark, and Water/Dragon types. So while it is definitely a good idea to bring your electric types, bringing your Grass types can be just as helpful, especially when dealing with Water/Ground types that both leaders use. For more information on the Pokemon Wallace uses as a Gym Leader, check out the 'Team' section.
The Sootopolis City Gym makes an appearance in the Pokemon anime. At the time, Juan is the current leader. These episodes are AG (advanced generation) 110, and 111. Unfortunately, the Gym is not properly visited in the manga series.
Gym Solution - Omega Ruby/Alpha Sapphire
Gym Solution - Ruby/Sapphire
Gym Solution - Emerald
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