[Night Fury]

well part of the only reason I haven't played the game is that to get Jirachi you just have to get through the beginning tutorial and battle your rival and talk to the professor again and then catch 4 or 5 more pokemon
Then you put the disk either into a game cube or the wii
there is also a cable that connects the gameboy advance to either one of those systems
now that would have to trade up to pearl and those versions
that game would have to be completed which would allow you to move jirachi
then trade them to soul silver or heart gold and then send them up to one of the black or white games and then through the poke transporter to the bank

you can reset the game, and as long as you are willing to go through all those steps and playing two mini games one with pearl and the other when sending pokemon to black and white- I can't remember but I think one or both of those games have a limit on how many times you can do that in a day