You go to Pyrite Town and go to the building southeast of the Colosseum, go in there go to the east side of the room and a girl will be standing there wanting to battle you. If you don't want to battle stay on the right side of the room and talk to the door to the elevator, and use the elevator key, and you'll go down to "The Under".
Action Replay/Gameshark codes or you had to pre-order Pokemon Colleseum and use the Bonus Disk.
You can get Jirachi in Pokemon Games. Either trade from Colleseum or use a Gameshark.
Use the DNA scanner in the Lab to test the DNA you found in the lab the Pokemon that show up in the DNA are the combination.
use the lift key to use the lift
I think you use alink cable and go to the time machine in the Pokemon center. Its just a guees Answer no.2 actually u trade to colleseum and then to emerald Answer Number 3: Actually, you can't. Pokemon Crystal isn't compatible with Ruby, Sapphire, Emerald, or the Generation 4 games.
The way I know: You can get one on Pokemon Colleseum. (it's a game for the gamecube) than trade it to your sapphire or ruby game using the link cable (the one you use to conect a gameboy advance to a gamecube) than you have to migrate it to your diamond (or pearl) game.
you use it in the warehouse i think
in some dungeons there will be doors you use the key on the doors while facing them
stop being a Pokemon playin douche
oh hai
where you use the key to turn on the quary.
You don't