Link battle record with my friend. 101 straight wins :D
Our team varied as we went, but here is the basic team we followed.
Porygon-Z@Wise Glasses/Focus Sash
-Nasty Plot/Ice Beam (it changed depending on my mood ...)
-Hidden Power Fighting 68
Rock Head :/
-Aerial Ace (fuck off Double Team)
-Earthquake again lol
Not the most competitive movesets ever, but they haven't failed (much). They're fully EV/IV trained, but I can't be bothered to remember what they were EV'd for... I have it written down somewhere...
Our alternate team swapped out my Gallade for his Aerodactyl, while he used a Gengar instead of said Aerodactyl. The Gengar looked something like this:
Gengar@Focus Sash (silly game can't check for duplicate items if the items are on different teams :D)
-Energy Ball (fuck off Fissure Wishcash, I'm on to you)
Then he still had his Metagross while I used his Aerodactyl and the Porygon-Z.
The double Focus Sash leads and like 130 base speed on both of them assured us at least 2 attacks each barring the odd Hailstorm (and Sandstorm for Gengar's case). After Gengar was set to 1hp, we deployed the Destiny Bond. Being immune to Aerodactyl spamming Earthquake was also very helpful.
We were only taken down after a Mismagius employed the same strategy against our Metagross :(