http://bulbapedia.bulbagarden.net/wiki/Honchkrow_(Supreme_Victors_29)
If you run out of things to lostzone in their hand, you can darkness restore an unown Q then knock it out with cursed droplets.
If they continue to play their pokemon, or have none left in their deck/hand, seeker one up and then restore a pokemon (smeargle, spiritomb, etc) so they can't replay their pokemon.
Combo it with unown Q for free retreat
If you run out of things to lostzone in their hand, you can darkness restore an unown Q then knock it out with cursed droplets.
If they continue to play their pokemon, or have none left in their deck/hand, seeker one up and then restore a pokemon (smeargle, spiritomb, etc) so they can't replay their pokemon.
Combo it with unown Q for free retreat