Where is aegis cave in mystery dungeon explorers of sky?

first u have to finish the main story. then later I'm pretty sure after u let Manaphy back to the sea u go to the guild and no one is on the floor with the job boards so u go to the bottom floor and Team Charm is there surrounded by the guild members they talk awhile to Wigglytuff then talk about Aegis Cave then ur partner will ask them if u can join them. then u team charm and the WHOLE guild go to Aegis Cave