Deck Knight
Blast Off At The Speed Of Light! That's Right!
Ho-oh counters Skymin 61% of the time. 39% is the probability of hitting with and getting the effects of Seed Flare and Air Slash in succession. If Seed Flare misses or its effect fails, Ho-oh easily counters. If Air Slash does not flinch, Shaymin is destroyed by Sacred Fire. All bets are off if you use HP Rock (Skymin), all bets are off if Ho-oh is Scarfed (Ho-oh).Actually it doesn't counter Scizor and Skymin as well as you'd think... Not to burst your bubble or anything. If you can keep Stealth Rock off the field it at least works against Scizor. :P
but I'm not one to disagree about it, of course!
In other words, you have a similar shot of taking out Ho-oh with Sheer Cold as you do with Skymin.