Aegis Cave is unlocked through natural story progression, not rank. When Team Charm (composed of Lopunny, Medicham, and Gardevoir) visit Wigglytuff's Guild, everyone goes off in search of the cave's great treasure.
You gotta defeat Unowns in the aegis cave
After Manaphy goes back into the sea, do at least one job and go to sleep three times. Then, you will go to the guild and everyone will be gone. Go to the bottom, and Team Charm will be there, and you will join them on an expedition in Aegis Cave. You have to battle Regice, Regirock, Registeel, and even Regigigas and his minions.
no
your leader has to beat them,then they will ask to join your team (in aegis cave)
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.
Finish the exploration of Aegis Cave with Team Charm, then after beating Regigigas, it will be unlocked.
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.
No you need to get there yourself after you beat aegis cave and then i think the day after palkia will teleport you there
In Aegis Cave.
for the first chamber,get stones ice,next rock and finally steel.
You have to beat chapter 13
In Aegis Cave