After you release Manaphy, you go back to your normal rescue and outlaw catching duties. A few days after that you go into the guild and notice that no-one is on the first underground floor. Go down to the next floor and everyone is crowding around a bunch of celebrity explorers called Team Charm, which is made up of Medicham, Guardevior and the leader Lopunny. After you walk in they start to have a chat with Wigglytuff. They talk about a mysterious key and a dungeon. The key and the dungeon are linked together. Your partner asks them if you can join the exploration and they let the whole guild go. Hope this helps.
you go to aegis cave in registeels room and you go to kick butt.
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.
You gotta defeat Unowns in the aegis cave
for the first chamber,get stones ice,next rock and finally steel.
Kill an unown that's shaped like an R
# 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.
You need to enter the cave with Team Charm.
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)
Finish the exploration of Aegis Cave with Team Charm, then after beating Regigigas, it will be unlocked.
if you mean on the dungeons list AEGIS CAVE is after miracle sea..veronica