Pokémon Mystery Dungeon: Blue Rescue Team and Red Rescue Team/Stormy Sea

To enter Stormy Sea you have to beat Rayquaza. After beating Rayquaza talk to Medicham then Lombre then go to Whiscash’s pond and he'll give you the TM dive.

The Dungeon
This level is hard with water-type Pokémon. It has 40 floors and at the bottom is Kyogre.You should pack up on Max Elixirs, apples, HM dive and berries. Bring two strong team members to the dungeon at least at level 40. For the first 10 floors, it is easy with weak Pokémon like Seel. After that it gets hard - the Pokémon are stronger but there are more items to pick up. At floor 30, it is almost impossible to get through. There are about 20 Pokémon per floor. Some can defeat you in one hit so be careful. You should just head straight to the stairs. Once you reach Kyogre, he's hard to beat. You might have to hit him about 20 times. Good luck

Items
You can find many things in the dungeon. You can find orbs. There are Escape, Cleanse, Pounce, Heal, Radar, Scanner and other types of orb. You can find every kind of berry and Max Elixirs. There's lots of money to find and different scarfs and bands.

Boss Battle: Kyogre
Kyogre is on 40f. You cannot recruit him on the first try. On the second try make sure your size is not over 2. Then go challenge him and he might join. He has a 50% chance of recruiting him.