1)Super Energy Removal and Energy Removal.
Remove the Darkness Energy to leave it crippled.
2)Big Basics. They're faster, so Sneasel will
be gone before the Energy's on. He doesn't stand a Chansey:) against
Electabuzz or Hitmonchan.
4)Sneasel's superior, Wigglytuff. One-hit KO.
Sneasel is just a pesky little fly to this guy.
3)Rocket's Sneak Attack, Lass, Chaos Gym, Dark
Vileplume, etc. Keep your opponent from getting a full bench by restricting
their card drawing.
5)Narrow Gym and Rocket's Minefield Gym. Okay,
so they're not THAT great. They will help though.
Hope this helps!
~Brian Adam