Need help with my Diamond team for the E4

[lordsigmund]

This is the team that I'm gonna take to the Elite Four when I train it up. Using only moves that they learn by leveling up (maybe breeding too) so I dont have to use any TMs at the moment.

Had a look at the type chart, and tried to choose pokemon that I liked the look of that covered all types of pokemon I might face. Its a bit weak vs Psychic pokemon, with Gengar being weak to Psychic himself, but Torterra and Gachomp have Crunch as well.

Gachomp
-Dragon Claw
-Crunch
-Dig
-Fire Fang

Gengar
-Shadow Ball
-Dark Pulse
-Hypnosis
-Dream Eater

Torterra
-Wood Hammer
-Crunch
-Earthquake
-Giga Drain / Leech Seed

Medicham
-Force Palm / Hi Jump Kick
-Confusion / Psycho Cut (if I can be bothered breeding it in)
-Ice/Thunder/Fire Punch
-Recover / Meditate

Dialga
-Dragon Claw
-Ancientpower (need something to use against flyers)
-Metal Claw (would be Flash Cannon if I was gonna wait around and level it to lvl 80)
-Dragon Breath / Roar Of Time (looks nifty, but i dont really like 5 PP moves)

For the 6th, I dont have any STABed fire or flying moves to use against Bug and Grass pokemon, only Fire Fang on Gachomp, and maybe Fire Punch on Medicham so I thought maybe a Rapidash to finish. I really dont like Infernape or Rapidash though, so if you could suggest a better 6th, that would be great.

Rapidash
-Flare Blitz
-Poison Jab
-Agility
-Megahorn? / Bounce? / Takedown?

Can anyone give me any pointers / criticism / help with the moves I'm not sure about, and maybe what items to use please. Any ideas on something I could use instead of boring Rapidash?

Bearing in mind that I'm not going to be using any TM moves, just ones I can teach it by levelling up, the move tutor, or breeding if I really have to, and that this is only for beating the game, NOT for competitive play ( I dont want to hear about natures/IVs ).

Thanks for any help :)

[Lord Torterra]

decent team, but heres some tips:
get earthquake for garchomp. if you cant, dig is fine.
get rid of giga drain and get something like energy ball
for dialga, use roar of time instead of dragonbreath. it may be 5 pp, but dragonbreath is a pathetic dragon move.
otherwise, its good.