My current list is:
1. Celebi w/ HP Fire or Ice 70
2. Deoxys (31 all IVs)
3. SMR Keldeo with HP Ice 70
4. Bold or Timid Jirachi with Wish and Draco Meteor (Old event, 31 all IVs)
I think that's about it. I could get almost all Pokemon in any game, except for those.