Personally, my favorite move sets are:
Crunch- Dark - Really useful against the psychics. And I cant get Dark Pulse.
Sheer Cold- Ice- Inaccurate but awesome OHKO move
Heatwave- Powerful fire attack with no aftermath repercussions
Surf- HM move that I still find useful during battle
Energy Ball- Grass- Good effective grass move
Frenzy Plants- Grass- Very powerful grass move
Crunch- Dark - Really useful against the psychics. And I cant get Dark Pulse.
Sheer Cold- Ice- Inaccurate but awesome OHKO move
Heatwave- Powerful fire attack with no aftermath repercussions
Surf- HM move that I still find useful during battle
Energy Ball- Grass- Good effective grass move
Frenzy Plants- Grass- Very powerful grass move