get the unknown letters R,O,C,K. It'll tell you what letters the stones are in your inventory.
In Aegis Cave
aegis cave
aegis cave at level 49, along with regirock, regice, and registeel.
You have to go to Aegis Cave, But to get there you need to release manaphy into the sea and sleep for a few days and then team charm comes and takes you to Aegis Cave.
after beating dialga and rescuing scizor, do a few missions and eventually in the lower level of the guild. after listening to people talk for a while you will be able to go to aegis cave
you continue on to regigigas chamber
Do a few jobs, and after a while a Mr. Mime will show up by the Kecleon Shop in Town. Talk to him to continue your adventure to Aegis Cave.
your leader has to beat them,then they will ask to join your team (in aegis cave)
# 1)ice aegis cave 3fl # 2) regice # rock aegis cave 3fl # 3)regirock # steel aegis cave 4fl # 4)registeel # aegis cave pit 5fl # regigigas chamber :regigigas, 4hitmonlee and 4 bronzong 19 floors
in aegis cave in the rock chamber{ice will be first so you will fight regiice then regirock}
aegis cave all floors except for after you pass registeel chamber
if you mean on the dungeons list AEGIS CAVE is after miracle sea..veronica