Pokemon Diamond Discussion
Gengar, Metagross/ Skarmory and Dusknoir.
IMO you should replace Garchomp with Gyarados (if you think your opponent is going to use an electric attack switch to Electivire and get a speed boost from it).
Gyarados move set:
Waterfall/ Aqua Tail.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem