That is a bloody amazing Ho-oh that you somehow obtained. The IV's are spectacular and the ability is acceptable, albeit not great. Based on the information given, a Ho-oh could easily work out with this nature and its IV's. I would give it:
Sacred Fire - STAB bonus and great chance of a burn infliction.
Sky Attack/Brave Bird - With the decent attack of your Ho-oh, and the STAB bonus included, Sky Attack or Brave Bird will absolutely wreck opposing Pokemon.
Recover - Since this Ho-oh is pretty nice defensively, I would give it Recover to make him last longer.
This last move is really up to you, but I would give it Earthquake because of its offensive coverage.
If you want a Ho-oh with a better nature, you could keep going, but I advise you to keep this one.
I hope I helped.