The Hydreigon not being brought close to KO range by Fairy Wind almost makes me think that Fairy isn't actually super effective against Dark as Pokebeach implies. Perhaps there are a few errors on those type matchups.
Then again, the Gardevoir could have been underleveled...
How does any of this imply that it's something to be feared, though? Garchomp is still OP despite the prevelance of Ice-type attacks; why should having yet ANOTHER weakness suddenly mean that this new type is too strong?
Ice type lacks fast, powerful killers that can outspeed Garchomp before it waylays them with a fire fang, brick break, or earthquake.
Fairy Type already looks like it has potential with Gardevoir's type retconn'd.
"You got to be careful if you don't know where you're going, because you might not get there." - Yogi Berra