How do you get to the aqua team hideout?

Well for a while, I thought it was anywhere but where it is; being at Lillycove was a surprise to me. Firstly you have to have surf, one of the HMS in the game, and you must go to the east aka the -> of Lillycove and maybe a bit south then north again. The cave may be blocked for a while, I am not sure why, but soon you can go in and venture through the hideout. ^_^ The only problem is is that I havn't played for a while, so I may have forgotten about the hideout at Stark Mountain. Any other hideouts are unknown to me, but I hope this information helps. The hideout at stark mountain may actually belong to team magma (what with a magma crony standing around in front of a secret door with a special magma emblem.) (=8^[)<-3

Welcome for the help!