Let's see what you can do. The battle field is small enough, so the foe won't have much space to move, so let's burn the foe using Will-O-Wisp.
Next, if the foe isn't burned yet, repeat your last move and be sure to burn her. If it's already burned, let's give her some poison using Toxic.
If the foe happens to use Protect or Detect, you use Double Team instead.
Will-O-Wisp/Double Team ~ Will-O-Wisp/Toxic/Double Team