After you catch Rayquaza, you can go back to the Sky Pillar and there is a portal where Rayquaza used to be. Enter it, and you will enter a room and be able to catch Jirachi.
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There is no jirachi's cave.
you need Pokemon channel for gamecube and you get Jirachi as a bonus.
yes with an event.
A shiny Jirachi can be very rarely obtained from using the Pokemon Colosseum bonus disc repeatedly to find Shiny Jirachi. Once it is obtained, you can migrate it from Pokemon Ruby, Sapphire, or Emerald to the Pal Park.
THRE IS NO JIRACHI EGG TRICK THEY JUST MAKE IT UP