...... hmmmmm, rotom is a rather weak pokemon in its original form, maybe switch in a trevenant or recovery jellicent which would look something like this:
Jellicent @ Leftovers
Water Absorb
252 Hp / 130 SpA / 126 SpD
Modest
- Shadow Ball (Ghost STAB)
- Scald (Counter)
- Toxic (Poison)
-...