To address all of the Keldeo counter posts, perhaps Tornadus-T is why they aren't used so much. It blows Celebi and Amoonguss away with Hurricane, Latias doesn't enjoy it or U-turn, and Jellicent... should take Torn-T on relatively well actually. It's sort of like how Excadrill partly contributed to Thundurus-I's brokenness - Thundy could be stopped by certain Scarfers... but Excadrill made them a liability since it killed them off.
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