Disruption: Head ringer, Hex Maniac, Xerosic (to discard a float stone), Silent Lab, Garb.
Attackers: Leafeon, Sceptile/M Sceptile EX, VirGen, and anything that hits 170 + Lysandre.
What you should know is that if your opponent is attacking your Keldeo, then you are doing something right. It's a minor setback for you that gets rid of a non-attacker. It's like getting rid of Malamar-EX in a fairy deck; sure, both are useful, but they aren't getting rid of your main threat, which is Xerneas EX or Florges EX (Kyurem in your case), nor your main support Aromatisse (Deoxys or Thundurus). They should have fried a much bigger fish is all I'm saying, which is what I think many opponents would do in a similar situation, unless if it's the last two prizes sensibly.