FYI, here's some info you should know.
1: This mystery gift is for *all* the games, D/P/Pt/HG/SS.
2: The Jirachi's IVs and Nature are random when collected at the pokemart.
3: This Jirachi unlocks the pokéwalker route "Night Sky's Edge" on HG/SS, but that's useless to most people.
4: Jirachi cannot learn Draco Meteor naturally, and it cannot relearn it if it is deleted.