The keys (and you can buy more from the Kecleon store) are used to unlock treasure rooms inside certain dungeons. For example, Zero Isle North has one containing 6 Joy Seeds on floor 40, but others have things like the stat-boosting Silk items, and treasure items for the legendary pokemon.
After finishing Aegis Cave, wait about 3-5 days, and Bidoof will come looking for you asking you to come to the Guild. Appears that Azurill has a nightmare, and Mt. Travail will be unlocked.
You can sometimes find keys on the lowest levels of Aegis Cave. You can also buy them at the Kecleon shop in Treasure Town sometimes, they are 8000 poke.
Aegis cave has 3 Ice floors, 4 Rock floors and 5 steel floors, with a stone marker floor before each section, and a floor for each guardian fight below this. Then there are 6 deeper floors before Regigigas' Chamber.
Yes you can but regice, steel and rock all might take more than one time to recruit after aegis cave. Regigas is 100percent recruitment so you just fight him once after aegis cave. ( note: i got all the regis except for ice on my first try so their not THAT HARD to recruit).
In the dungeon, sometimes a defeated Unown will drop a stone shaped like itself. You need to collect the stones that spell out "ROCK". At the non-dungeon part, check the pillar in the center and follow the instructions. The stones you collected will react with the pillar, revealing a stairway. You do the same for Ice and Steel Aegis Cave.
your leader has to beat them,then they will ask to join your team (in aegis cave)
In Aegis Cave
Kill an unown that's shaped like an R
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.
You have to get the stones that the unknown drop and use them at the stone marker.Like at the begining you have to get the unknown stones that spell ice.
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.
You gotta defeat Unowns in the aegis cave
Just head back through Aegis Cave and fight him again. There's a chance of recruiting him whenever you fight him.
if you mean on the dungeons list AEGIS CAVE is after miracle sea..veronica
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