Sootopolis City. Check www.serebii.net for more info on Pokémon Ruby.
in sootoplis
Wassilij
Catch groudon
You must finish the mission that would make the weather the same again. After that, everyone will be all happy and the eighth gym will be open to you.
What game are you talking about? On ruby/saphire, go to team magmas hydout where groudon fleas.
it is in sootopolis city which is under water it should be on your hoenn map.
The eighth gym leader is in the underwater city(forget the name) but it is where you fight groudon. after you beat him the gym should be open.
first of all you get groudon not rayqaza that's emerald and you get him near the eighth gym
mr briney is at slateport helping the people make the ship
you want to stand in the left right up down arrows. and of cors you want to switch all the switchers.
The eighth gym leader is Claire in Blackthorn City
it depends............................WHICH GAME??!!??!!