I got swept by Honchkrow the first time, but the second time around, I just hit it with a Close Combat and let it kill itself with Brave Bird. Then Calm Mind/Drought Ninetales cleaned up.
Umbreon was a huge hassle, though. It was so wally (high defensiveness, leftovers, 100000 hyper potions), I almost ran out of flamethrowers.
This was one of the only fights I won with a severely underleveled teammate (and I didn't even use it as a sacrifice for an extra turn, either!)