no
Beat Jirachi
You use it to get to Jirachi.
no
jirachi is found at the end of wish cave
NO..VERONICA
Try getting a link cable for a gameboy and the gamecube then see if there is an option somewhere in Pokemon Colloseum. However, I don't believe you can trade Pokemon from Pokemon mystery dungeon to another game.
in the second cave
You can't in Pearl. To be honest Jirachi was not available in any game. However if you pre-ordered the Pokemon Colosseum Japanese version you would receive the Bonus Disk, in which you could send Jirachi to Pokemon R/S/E then migrate it to Pearl. you can get jirachi from a mystery gift
well at the end of the game you meet the Pokemon called jirachi you will have dialga and palkia on your team you can be them i would say be dialga so beat jirachi with dialga and then jirachi will evolve any Pokemon for you ok.
You have to use the Mystery Gift option and connect to Wi-Fi from the End of June 2010 to about mid-July 2010 to get a Jirachi Wonder card and the Pokemon Jirachi.
Jirachi is at the last floor of Wish Cave in Blue and Red Rescue team. There are 99 floors, so be prepared.