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are you using poke assists? they help alot,try using ones that will stop there movement and attacks so you can try and capture.
if i remiber correct i used electric assist on him
i think the best pokeassist is steel. you throw little shards of steel at it and while your doing that it cant attack for some reason. its awsome, i beat darkrai with my sheildon (probably spelt that wrong. sorry fans of Sheldion)