This is my third rmt for OU, and I like to think that I have learned a lot from my first one. It has fairly good synergy, and doesn't bypass any resistance completely, but still some work can be done. Any advice is appreciated!
Metagross @ Occa Berry/Leftovers
Ability: Clear Body
Nature: Adamant (+Atk, -SpA)
EVs: 252 HP/236 Atk/12 Def/8 Spd
- Bullet Punch
- Earthquake
- Stealth Rock
- Meteor Mash|Explosion
This is my lead and anti lead. It is really good for breaking sashes with meteor mash followed by a bullet punch. And if they switch out, then it's a free SR for me. I chose earthquake over explosion, that way he would be more viable as a tank later in the match, and can damage fellow metagross. The ev's are questionable, and I'm kinda leaning toward Rhys29's bulky metagross spread (204 HP/88 Atk/204 Def/4 SpD/8 Spd), but I'm not sure if it is still a good spread for a lead. Item choice is up in the air, as when I had Heatran/Arcanine on my team Metagross was good bait for fire users to use an attack, not KO me, then swap in my flash fire pokemon to wreck havoc, but I think that now leftovers will yield longer survivability. This lead doesn't go well (or so I have been told so far) with the team very well, so I am more than happy to swap for a better alternative.
Porygon2 @ Leftovers
Ability: Trace
Nature: Bold nature (+Def, -Atk)
EVs: 228 HP/188 Def/92 SpA
- Ice Beam
- Recover
- Thunder Wave
- Thunderbolt
Salamence, Gyarados, Heatran counter, works fairly well, and also works great when I trace say a water absorb or a motor drive :] Thunder wave to spread status around which lets me get some quick recovery moves in. I get lucky with para hax a lot, so I wanna keep this over toxic since Thunderbolt covers the bulky waters that would be targetted with toxic. Boltbeam coverage is great, and has enough SpA to do decent damage, even without STAB. Recover to heal from residual damage or an outrage or waterfall or whatever I'm switching into.
Rotom-h @ Choice Scarf
Ability: Levitate
Nature: Modest nature (+SpA, -Atk)
EVs: 156 HP/228 Spd/124 SpA
- Overheat
- Shadow Ball
- Will-o-wisp
- Trick
This guy is my spin blocker and lucario/scizor/wall counter. Has 3 immunities which are greatly appreciated in this team, and a boatload of resistances too. He outspeeds adamant lucario and ohko's before he can SD crunch me for the ohko. Also, WoWing switch-ins, since they are usually physical usually works wonders and allows me to survive the pursuit. I was thinking of Spiritomb as my spin blocker, and he's also not weak to pursuit, but having another ground immunity really helps, so it's up in the air right now. Good hp number when I trick leftovers from a wall or a pokemon that I expect to set up.
Tyranitar @ Babiri Berry
Ability: Sand Stream
Nature: Jolly (+Spd, -SpA)
EVs: 4 HP/252 Atk/252 Spd
~ Dragon Dance
~ Crunch
~ Stone Edge
~ Fire Punch/Aqua Tail
Babiri and Jolly nature make Tyranitar always defeat Scizor switch-ins to it. Jolly outspeeds Adamant Scizor before a Dragon Dance. This means that if it tries to use its Fighting/Bug move on me, I will destroy it with Fire Punch. Babiri Berry is there if uses Bullet Punch, so Tyranitar can survive that and OHKO with Fire Punch.
Heracross @ Leftovers
Ability: Guts
EVs: 204 HP/56 Atk/180 Def/68 Spd
Adamant nature (+Atk, -SpA)
- Sleep Talk
- Rest
- Brick Break
- Megahorn
My bulky physical sweeper and second status absorber. Also my tyranitar and wall counter, which works pretty well. Guts helps a lot when they status me, and even more when I rest it off ^_^. brick break and megahorn for STABs I chose brick break over night slash for coverage, but I am thinking that since fliers (like zapdos) resist both, maybe I will keep brick break on ttar and swap it for night slash here. Not that I would keep my heracross in on a zapdos, but I'm saying for the switch in
Latias @ Life Orb
Ability: Levitate
EVs: 80 HP/176 Spd/252 SpA
Timid nature (+Spd, -Atk)
- Calm Mind
- Dragon Pulse
- Surf
- Recover
My special sweeper, which provides some needed resistances and on the switch I can calm mind up and then do a fair amount of damage with a STAB dragon pulse or Surf. Recover to brush off the residual damage from Life orb and sandstorm. Enough speed to outspeed base 100's with a choice scarf. I was thinking maybe going 76 HP/180 Spd/252 SpA to outspeed typical Mixape since he can ohko me as well as other latias, but so far I haven't encountered any of them. Also calm mind coupled with recovery can make for an annoying pokemon, especially if they let me get at least 2 in, then they're in for a hurting.
Anyway, that's my team and it has been doing alright on shoddy. However I would like to someday get this to wi-fi, and since rotom-h is unattainable for wi-fi, suitable replacements would be great! Indecisive on my lead, so advice about that would be appreciated as well. I need a steel pokemon for ice and dragon resistances to cover Latias, and metagross does it, but he usually dies so other options for that would be appreciated too (Bronzong was suggested, I just don't know where he would fit). Currently, I have every type covered by at least 2 pokemon, except Water, Ice, and Dragon, to which I have one. I am thinking I may need another water resistant pokemon, since latias isn't meant to take too many hits right off the bat, even though she does a fair job at it. Any advice at all would be greatly appreciated and please RMT! :)
Images thanks to Pokemonelite2000.com and Arkeis.com
changes in bold

Metagross @ Occa Berry/Leftovers
Ability: Clear Body
Nature: Adamant (+Atk, -SpA)
EVs: 252 HP/236 Atk/12 Def/8 Spd
- Bullet Punch
- Earthquake
- Stealth Rock
- Meteor Mash|Explosion
This is my lead and anti lead. It is really good for breaking sashes with meteor mash followed by a bullet punch. And if they switch out, then it's a free SR for me. I chose earthquake over explosion, that way he would be more viable as a tank later in the match, and can damage fellow metagross. The ev's are questionable, and I'm kinda leaning toward Rhys29's bulky metagross spread (204 HP/88 Atk/204 Def/4 SpD/8 Spd), but I'm not sure if it is still a good spread for a lead. Item choice is up in the air, as when I had Heatran/Arcanine on my team Metagross was good bait for fire users to use an attack, not KO me, then swap in my flash fire pokemon to wreck havoc, but I think that now leftovers will yield longer survivability. This lead doesn't go well (or so I have been told so far) with the team very well, so I am more than happy to swap for a better alternative.

Porygon2 @ Leftovers
Ability: Trace
Nature: Bold nature (+Def, -Atk)
EVs: 228 HP/188 Def/92 SpA
- Ice Beam
- Recover
- Thunder Wave
- Thunderbolt
Salamence, Gyarados, Heatran counter, works fairly well, and also works great when I trace say a water absorb or a motor drive :] Thunder wave to spread status around which lets me get some quick recovery moves in. I get lucky with para hax a lot, so I wanna keep this over toxic since Thunderbolt covers the bulky waters that would be targetted with toxic. Boltbeam coverage is great, and has enough SpA to do decent damage, even without STAB. Recover to heal from residual damage or an outrage or waterfall or whatever I'm switching into.

Rotom-h @ Choice Scarf
Ability: Levitate
Nature: Modest nature (+SpA, -Atk)
EVs: 156 HP/228 Spd/124 SpA
- Overheat
- Shadow Ball
- Will-o-wisp
- Trick
This guy is my spin blocker and lucario/scizor/wall counter. Has 3 immunities which are greatly appreciated in this team, and a boatload of resistances too. He outspeeds adamant lucario and ohko's before he can SD crunch me for the ohko. Also, WoWing switch-ins, since they are usually physical usually works wonders and allows me to survive the pursuit. I was thinking of Spiritomb as my spin blocker, and he's also not weak to pursuit, but having another ground immunity really helps, so it's up in the air right now. Good hp number when I trick leftovers from a wall or a pokemon that I expect to set up.

Tyranitar @ Babiri Berry
Ability: Sand Stream
Nature: Jolly (+Spd, -SpA)
EVs: 4 HP/252 Atk/252 Spd
~ Dragon Dance
~ Crunch
~ Stone Edge
~ Fire Punch/Aqua Tail
Babiri and Jolly nature make Tyranitar always defeat Scizor switch-ins to it. Jolly outspeeds Adamant Scizor before a Dragon Dance. This means that if it tries to use its Fighting/Bug move on me, I will destroy it with Fire Punch. Babiri Berry is there if uses Bullet Punch, so Tyranitar can survive that and OHKO with Fire Punch.

Heracross @ Leftovers
Ability: Guts
EVs: 204 HP/56 Atk/180 Def/68 Spd
Adamant nature (+Atk, -SpA)
- Sleep Talk
- Rest
- Brick Break
- Megahorn
My bulky physical sweeper and second status absorber. Also my tyranitar and wall counter, which works pretty well. Guts helps a lot when they status me, and even more when I rest it off ^_^. brick break and megahorn for STABs I chose brick break over night slash for coverage, but I am thinking that since fliers (like zapdos) resist both, maybe I will keep brick break on ttar and swap it for night slash here. Not that I would keep my heracross in on a zapdos, but I'm saying for the switch in

Latias @ Life Orb
Ability: Levitate
EVs: 80 HP/176 Spd/252 SpA
Timid nature (+Spd, -Atk)
- Calm Mind
- Dragon Pulse
- Surf
- Recover
My special sweeper, which provides some needed resistances and on the switch I can calm mind up and then do a fair amount of damage with a STAB dragon pulse or Surf. Recover to brush off the residual damage from Life orb and sandstorm. Enough speed to outspeed base 100's with a choice scarf. I was thinking maybe going 76 HP/180 Spd/252 SpA to outspeed typical Mixape since he can ohko me as well as other latias, but so far I haven't encountered any of them. Also calm mind coupled with recovery can make for an annoying pokemon, especially if they let me get at least 2 in, then they're in for a hurting.
Anyway, that's my team and it has been doing alright on shoddy. However I would like to someday get this to wi-fi, and since rotom-h is unattainable for wi-fi, suitable replacements would be great! Indecisive on my lead, so advice about that would be appreciated as well. I need a steel pokemon for ice and dragon resistances to cover Latias, and metagross does it, but he usually dies so other options for that would be appreciated too (Bronzong was suggested, I just don't know where he would fit). Currently, I have every type covered by at least 2 pokemon, except Water, Ice, and Dragon, to which I have one. I am thinking I may need another water resistant pokemon, since latias isn't meant to take too many hits right off the bat, even though she does a fair job at it. Any advice at all would be greatly appreciated and please RMT! :)
Images thanks to Pokemonelite2000.com and Arkeis.com
changes in bold