Maybe the way to break this huge tie is to assume that you have the worst possible luck, like with Overheat, Dragon Tail, and Bolt Strike always missing, and perhaps the stupidest Skarmory and Blissey sets that can outpredict you 100% of the time. Some things may have a much harder time winning with a fully physically invested Snatch Blissey with Charm, Calm Mind, Thunder, or some crap. I think the most likely to walk out of there alive is Dialga with something like Thunderbolt, Substitute, Bulk Up, and Brick Break. It's able to outspeed both of them, stall out Blissey's Snatches with Substitute and Bulk Up, and nail Blissey and Skarmory with a Brick Break or Thunderbolt, respectively. Skarmory can't really do anything but Taunt it, and Blissey can't poison it or break its subs with Seismic Toss, Ice Beam, or whatever it has.
Tough decision, but Dialga is sitting the prettiest, I think.
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