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So what are some good counters for Charizard Y Doubles teams?
I'm currently 1650 ranking in wi-fi doubles and these teams give me more trouble than anything else. They tend to pair Charizard up with another Fire-type and then AoE nuke with Sun-boosted Heat Wave.
Water types aren't much help due to Drought and Charizard Y's Solar Beam, and Rock types are also pretty weak to Solar Beam. Dragons are a fairly appealing option, but Sun-boosted Charizard and whatever else it's partnered with that benefits from the sun usually hit hard enough that resistance ends up not meaning much.
I do use a Blaziken, who can learn Rock Slide. That would be useful, but I'm loathe to give up Poison Jab on it.