Wallace is probably the easiest Pokemon champion ever considering he only has 6 Pokemon of the same type: Water! So if you have an electric type and grass type that battle is a walk in the park.
what you do is import it from ruby or Sapphire after you beat the game.
If you mean "Is Juan the leader in Pokemon ruby?", then no. It's Wallace who's the leader. Juan is leader only in Pokemon emerald. The champion is Wallace in Emerald, but Steven is the champion is Ruby and Sapphire.
Pokemon Ruby, Sapphire and Emerald are all Hoenn GBA games. I recommend Emerald, because it's newer, with better qualities and a different Champion who is somewhat easier to beat (The Water-type Wallace instead of the Steel-type Steven).
in Pokemon emerald simply beat the elite 4 then you will be invited to the battle frontere then find it but it is not in sapphire or ruby sorry bout dat
you. Need. To. Get. Through. A. Master. Rakned. Contest
Get all 8 gym badges then go to ever granade city in the Pokemon league then beat the 4 elites in the elite four and then you'll go to Wallace. If you beat Wallace you'll get a ribbon each for the Pokemon in your party that doesnt have one. TIP: If You want to level up your Pokemon quickly and you defeated them you can visit them again and battle them.
Sootopolis, and Kyogre is located there too :-).
Wallace is the champion. you will find him after you beat the elite4
In the elite 4 hes the champion
latias
Yes.
Go to the Elite 4, and beat them.
I don't know!Wallace appears in Ruby Sapphire and Emerald.Most likely from Emerald but there may be some elements from Ruby and Sapphire.
use psychic Pokemon and beat all the trainers to get more light
Get Kyogre..
You have to beat flannery
unova