It has never been said but there is a rumor it has something to do with ash,just go here http://serebii.net/movies/jirachi/pics18.shtml and scroll down the page to see.
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To get rid of the problem. When Max asked for all of the candy, she wanted to get rid of it.
Jirachi
It is genderless like the other legendaries, except Heatran, Cresselia, Latias, and Latios, but in the movie, Jirachi is voiced by a female actress, just like Kayzie Rodgers (4-Kids Dub).Despite this:Jirachi is a Boy Pokemon in The English Dub of Jirachi's Wish Maker.and, Jirachi is a Girl Pokemon in The Brazilian Portuguese Dub of Jirachi's Wish Maker (Brazilian Portuguese: Pokémon 6: Jirachi - Realizador de Desejos).In Pkmn Mystery Dungeon(Japanese version) Jirachi's a boy, so.....
Kyogre is in Pokemon ranger and the temple of the sea.Groudon did not appear in the movies, the movie Jirachi wish maker has a fake groudon instead of a real one.
One of my friends told me you can get jirachi at the end of Mt. Moon and I have tried but I can't figure out how to get there. I do believe there is a jirachi in heart gold version because there are sinnoh Pokemon in it and I have found mewtwo. In gold version however, jirachi cannot exist for gold version was made before jirachi was. I wish you luck in finding the legendary jirachi and other Pokemon!