About Snorunt's attack:
It was most definately Icy Wind (or perhaps Powder Snow, I forget if Snorunt learns that), and consisted of various-sized blasts of sparkling icy energy. Unlike the Ice Beam or Blizzard attacks it didn't do much to damage the opponent, whoever was hit with it was just briefly covered in ice before shaking it off (except Corphish). In the games Icy Wind just slows the opponent down and does minor damage, and it seemed to be the same here (though it didn't look like the Icy Wind used by an Azumarill in Johto).
Even the way it froze things was different from Ice Beam and Blizzard. Instead of encasing the foe in large block of ice, it basically coated them with a snow-cone like covering that simply immobilized them for a time.
I like Snorunt's personality and can't wait to see what will happen next with it. It's a rather unique creature, most similar to Corphish but without the temper and with a more mischevous than giddy personality. It also seems to have a set of attacks quite different from any Pokemon Ash has had before, and I'm curious how Ash will use it in battle beyond the Double Team/Headbutt combo it used on Pikachu. It's a little strange, all this time Ash has never had a Pokemon with the common attack Double Team but now he has two! *imagines a double battle with Snorunt and Swellow as they fill the field with mirror images*
Was I the only one touched by little Snorunt not wanting to give all of Ash's badges back because it didn't want Ash to leave? *sniffs* That would have made the episode but Snorunt than wanting Ash to prove his worthiness beyond any doubt by defeating it made it even better. I am not against no-battle captures as they capture the essense of Pokemon (befriending and building bonds with the creatures as you train), but well-done battle-captures (where the Pokemona nd trainer mutually decide to battle with capture on the line) are even better. Who would have thought the writers could do so much with a Pokemon that seems so limited and plain as a character due to its body design?
Just checked, it seems Snorunt learns both Icy Wind AND Powder Snow. But I still think it was most likely Icy Wind. The level-up moves are in order: Powder Snow, Leer, Double Team, Bite, Icy Wind, Headbutt, Protect, Crunch, Ice Beam, Hail, Blizzard. For Egg moves all it gets is Spikes and Block, but the TM moves are nicely varied, including things like Safeguard, Water Pulse and Shadow Ball, so there is quite a bit the writers could have Ash's Snorunt do.