Currently, Jirachi is not obtainable through traditional methods in Pokemon Ruby Version.
You can't. You can only get jirachi in ruby and sapphire. You would have to trade from ruby or sapphire.
You can't get jirachi in ruby unless you receive it from the Pokemon colosseum bonus disc.
You can't
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Jirachi is an event Pokemon, so it has to be received by a Nintendo event. Or you can hack (Best not to).
It's not possible to get jirachi unless you get it from the special disc of Pokemon colosseum.
You cannot find Mew, Celebi, Jirachi and Deoxys in Pokémon Ruby. Mew, Celebi, Jirachi and Deoxys are event-only Pokémon. Jirachi was available on the pre-order disc for Pokémon Colosseum that would allow you to download Jirachi from the disc over to Pokémon Ruby.
What pokemon? jirachi
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Latios, Groudon, and I think the three old Regis (this doesn't include Regigigas), I'm not sure about Jirachi...most likely Jirachi is in Ruby
Jirachi is not available in Pokemon Ruby due to it being tied to an event. The event that made Jirachi available to be caught is no longer being supported.
You can't find Jirachi in the game, you must attend a Nintedo event to capture it.