wake up raquaza in the sky pillar
you have to get rayquaza to split groudon and kyogres fight up at sootopolis gym
You go to Sky Pillar after the 7th gym in Emerald. There are only 8 gyms.
You have to uncover the Submarine in Secret Cave in either route 224, 124, or 225. I haven't played Emerald in God knows how long.
go to the sky pillar after u have beat the 8 gym.
you get all 8 gym badges
well in ruby and sapphire you need to beat all gyms and then beat the elite four then it should be open but in emerald you only need to beat the 8 gyms
you must collect 8 gym badges then beat the elite four then the HOENN champion wallace.
in sootopolis ,,,or whatever,,,just dive then if you see a cave near the seaplants or what,,,just go through the cave and undive,,there you go 8th gym
The ISBN of Door Wide Open is 978-0-670-89040-8.
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.
It is not possible to open it. Even if you used an action replay code to pass through the door, there is nothing there.
1. Go to ever grande city. 2. get through Victory Road. 3. Beat the Pokemon league.