>>46315784Yeah it's a right pain:
To get Ho-oh you need to purify all 48 Shadow Pokemon then register six Story mode mons so you can take on Battle Mode. Beat 100 trainers in one go and Ho-oh will appear in your PC. This is separate from clearing Mt. Battle in Story mode, where you get a Time Flute.
In XD you need to do basically the same thing, though it can be done in Story mode, getting you a bunch of TMs and coupons along the way, but it has to be one straight playthrough and after winning you'll the Earth ribbon and get offered a Johto starter with the "ultimate" move, the only way to get it on them in Gen 3. You can do that 3 times total.
Meaning, if you want to do everything in the Orre games, you'll need to clear Mt. Battle FIVE TIMES, technically six because Colo's Battle Mode can be done in singles or doubles with different opponent's teams. Fuck that.