You have to get it from Action Replay or you need to trade, or Mirage it from the older Pokemon games into the Pal Park.
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Jirachi learns Trick by 1 of the Move Tutors in Pokémon Platinum, HeartGold or SoulSilver teaching it to it (Jirachi.)
im not sure if its still in effect, but there was a Wi-Fi event in early August YES YOU CAN GET JIRACHI IN POKEMON SOULSILVER AND HEARTGOLD if u have wi-fi press start after u see lugia or ho-oh(in bottom screen)then go to wi fi gifts or something like that and u can receive a jirachi through wi fi To get jirachi you would have had to use mystery gift in august or September 2010. I got it. maybe they can do it again next year
Not without trading from other games. In heartgold you can get ho-oh, lugia, mewto, kyogre, and possibly celebi and jirachi through event. Others can be obtained through trading or other means. It is possible to have all legendaries on one heartgold cartridge, though, if you trade from other game. You need platinum, and emerald, and firered or leafgreen.
I think manaphy is storger then jirachi because it can bond with jirachi
No, you cannot get Jirachi in Pokemon platinum.