Okay, without using any Stat moves. Mine doesn't know this, but I am trying to convince someone that this is a good Rotom moveset if they won't use stat moves (they don't want any Stat moves for some reason).
We have a para-flinch combo in Discharge and Dark Pulse. Dark Pulse also can deal with Ghost types if Shadow Ball runs out of PP, plus we have Electric STAB in Discharge.
Signal Beam is there to deal with Dark types.
Shadow Ball gets STAB, plus can deal with Ghost types.
Rotom @ Flame Orb
EVs: 4 Def / 252 SAtk / 4 SDef / 248 Spd
Modest Nature (+SAtk, -Atk)
- Hidden Power [Fighting]