Wish Blissey Event Help (Pokegen)

[Nofacekillah]

I'm trying to hack a Blissey that knows Wish, does anybody know the Met at/OT details? Are there any natures that are impossible to have on it? Which PID generation method do I use?

[Delta Blast Burn]

It's a hatched pokemon so just use your TID/SID from any gba game. As far as the pid generation, use (B-A-C-D) ®