You cant capture it in Pokemon diamond.You have to catch in emerald adn transfer it to Diamong through Pal Park.
No, it is inpossible to catch Jirachi on Diamon, Pearl or Platinum.
You can't at least if you are talking about Jirachi...
With PokéRadar
You need to get the Pokemon Colleseum disk. Jirachi can be traded from Pokemon Channel.
You can't catch Jirachi.
you cant you can catch it platinum then trade it to diamond
find it.
You'll have to revive it from an Old Amber.
To catch JIRACHI you have to use the Pokemon colloseum disk. To catch DEOXYS you have to go to a Pokemon Nintendo promo event and get the aurura ticket downloaded on your game.
It's impossible to catch Jiratchi in Pokemon Pearl version.
You cant........................UNLESS you use action replay
You cant, you must trade it from Diamon or pearl.