This is what I used to beat Lucy(it does work actually)
Espeon @ Twistedspoon
Calm Mind
Psychic
Bite
Morning Sun
Psychic *Should* OHKO Seviper, then Psychic till it faints :(
Then I used this(it REALLY worked)
Dragonite @ Pecha Berry
Dragon Dance
Earthquake
Aerial Ace
Facade
Although Facade should be Thunderbolt, I did it just for Lucy. I sent it in on Shuckle, Dragon Danced 2 or 3 times, I suffered from Poison for 1 turn because I got Pecha help. Then I used Earthquake, dead. Milotic comes out and got OHKO'ed by Facade.
Feel free to use that.
I reccomend any Pokemon with a wide Movepool. Sometimes if you want to pull off a Baton Pass chain(Scizor + Agility + Swords Dance + Attack + Baton Pass) you can do that too.
[hmespeon -at- hotmail -dot- com] <~ MSN.