you fly to lily cove. you go right and up the stairs. then you go right more then you'll see ledgs you can jump dowm from. then go down those 2 ledges ONLY. the you go down these stairs. the move right and up. when you go up you need to be right next to the wall. then go up and you'll see a cave, go in and your done! but dont leave too early, because the entrance will close, so stock pile on full restores and revives. dont worry about pokeballs. if you find a master ball in the hidout the you'll have no problem with kyoger.
i think you get to the underwater cavern after beating the 7th gym leader
in aqua hideout 90%
In the Aqua Hideout.
All you have to do is save his "darling" Peeko (wingull) in the Rustturf Cave. You do that by beating the Team Aqua grunt in the cave and before that beating the grunt and saving the Devon Goods.
In team aqua's hideout
every where team aqua is or in snoop dogs house.
No, you cannot be a member of Team Aqua / Team Magma in Sapphire.
Google Pokemon sapphire walkthrough and search through a walkthrough
Team Aqua's base or hideout is found east of Lilycove City.
take the meteorite
team aqua hideout at lilycove city
Somewhere in the aqua hideout (you have to be in lilycove city)