I've just stomped this: https://www.reddit.com/r/pokemonrng/comments/5ny1el/scripts_and_guide_to_help_automate_rnging_a_shiny/
It's a program that helps in making a legit savegame that has a shiny jirachi checksum, which is kind of cool. Maybe it's time to just upload all possible shiny jirachis from the bonus disk? It would certainly be a lot easier, and since they are limited...
EDIT: I think the 9 only(?) possible shiny jirachis are already here (and they've been for a long time): https://sites.google.com/site/kaphotics/resources
Seed: 0x353d, PID: 0xba7df435, Nature: Bashful, HP: 24, AT: 3, DF: 30, SA: 12, SD: 16, SP: 11
Seed: 0xf500, PID: 0xc90e8744, Nature: Careful, HP: 10, AT: 0, DF: 10, SA: 10, SD: 26, SP: 12
Seed: 0xecdd, PID: 0x987ed636, Nature: Docile, HP: 19, AT: 7, DF: 10, SA: 19, SD: 10, SP: 16
Seed: 0x9359, PID: 0xbcfaf2b0, Nature: Hasty, HP: 3, AT: 12, DF: 12, SA: 7, SD: 11, SP: 9
Seed: 0xcf37, PID: 0x7b053548, Nature: Jolly, HP: 11, AT: 8, DF: 6, SA: 14, SD: 5, SP: 20
Seed: 0x7236, PID: 0x2ec1608d, Nature: Lonely, HP: 31, AT: 23, DF: 26, SA: 29, SD: 18, SP: 5
Seed: 0xa030, PID: 0x4633087d, Nature: Naughty, HP: 21, AT: 31, DF: 31, SA: 18, SD: 24, SP: 19
Seed: 0x7360, PID: 0xbf98f1d5, Nature: Serious, HP: 29, AT: 10, DF: 31, SA: 25, SD: 23, SP: 21
Seed: 0x3d60, PID: 0xeb0da543, Nature: Timid, HP: 15, AT: 28, DF: 29, SA: 3, SD: 0, SP: 7