On Leafgreen you trade for it on the Pokemon Colluseum bonus disc which you get when you pre-order the game.
You cannot catch Jirachi in Pokémon LeafGreen. You could only acquire it by trading with Pokémon Ruby or Sapphire provided you have access to the special pre-order Pokémon Colosseum Bonus Disc that allows you to download 1 Jirachi per game save file of Ruby or Sapphire.
There is not a way to catch jirachi in leaf green but i think you can in fire red
You cannot get it in leaf green. you have to trade it from Pokemon ruby, sapphire or emerald, or you buy a GameShark and you cheat him.
I think cheats are a very good tactic, because good cheats for this game are hard to come by. However, Action Replays are far more effective than GameSharks.
all you you have to do is get a game shark. then use the cheat to get 99 masterballs. Then use the game shark to get jirachi
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No, you cannot get Jirachi in Pokemon platinum.
You can't catch Jirachi.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Jirachi is a distrubtion pokemon that is not obtainable anymore unless by trading or cheating (gameshark)
there is no jirachi egg trick, but there is a celebii egg trick in Pokemon crystal