Pyrite Cave can only be entered in Pokémon Colosseum, with the entrance to it being blocked off in Pokémon XD: Gale of Darkness. When you enter the cave you will find yourself in a room containing St. Performer Simes. To the east of her is a chest containing 3 ethers, and a room to the north contains a chest with 2 hyper potions. Chaser Maiz will battle you when you go down the stairs. You will find stairs that take you up to a chest guarded by Chaser Rehan & Noxy which contains 3 ultra balls if you head east after beating him. The path to the north of those stairs is guarded by Rider Twan & it will lead you to a full heal & stairs going down to an area where you must battle Rider Sosh as you head west to arrive at a healing machine & PC. By going upstairs & heading north you will find the stairs leading to Miror B.'s room, which you must defeat Hunter Zalo to take. There is a path to the east that you can take to obtain items.