Long time reader, first time poster.
I just wanted to share my pokemon diamond doubles team. I don't currently have an image to show my streak, but i have so far reached 217 wins and have yet to lose. If anybody can suggest to me a place to host images, i can show proof later. So here is my team:
Infernape @ choice band
jolly 252 atk, 252 spe, 4 hp
flare blitz
close combat
thunderpunch
mach punch
Zapdos @ life orb
modest 252 spa, 252 spe, 4 hp
thunderbolt
heat wave
hidden power (grass)
roost
Metagross @ leftovers
adamant 252 hp, 252 atk, 4 def
iron head
earthquake
thunderpunch
bullet punch
Garchomp @ yache berry
jolly 252 atk, 252 spe, 4 hp
outrage
earthquake
swords dance
protect
Infernape and zapdos work well together. Infernape can one hit kill a LOT of things with closecombat or flareblitz with the help of choice band. Zapdos takes care of many annoying water types especially the hax sheer colders. Together, so long as there are no quick claw activations, infernape and zapdos take care of all sheer colders.
One of the biggest reasons i decided to use zapdos is because i've previously had trouble with trick room, especially from slowbro and slowking. Modest zapdos and life orb takes care of them almost guaranteed. Only slowking with 252 evs in special defense has a chance of not getting one hit killed.
If either infernape or zapdos dies, i usually switch to metagross who has saved me countless times. Metagross is my biggest tank and often takes care of lati@s, which is very useful to me because they have the potential to beat my team otherwise. Infernape usually dies first and when i switch in, metagross joins zapdos to form the great partnership that Peterko had mentioned before.
With the combination of fire/fight, electric, and steel type pokemon, ice types are surely eliminated. With ice types properly taken care of, the few times garchomp actually goes into battle, he is left to kill unhindered with a yache berry just in case a non-ice type uses an ice type move. Protect on garchomp acts as a great lure because if i am stuck with garchomp and metagross and i face a dragon or an ice type, i know they will attack garchomp so i protect to block the incoming attacks and metagross manages to kill one of their threats leaving me with 2 on 1.
EDIT: I reached 224 wins and I have proof now