Hello. I would like to present next team, with which I landed on 36 place in Ubers. Anyway, I'm using this one if I face heavy stall, which sometimes shows up on higher places in ladder. Anyway, here's the team.
Dialga @ Lum Berry
Ability: Pressure
EVs: 252 HP / 140 SpA / 116 SpD
Modest Nature (+SpA, -Atk)
~ Stealth Rock
~ Thunder-Wave
~ Draco Meteor
~ Fire Blast
It's pretty standard lead. It sets up Stealth Rock and paralyse some foes. Draco Meteor is my choice as it OHKOes Darkrai and any Deoxys-S without Focus Sash. Lum Berry makes sure that Darkrai won't sleep me in first turn. Fire Blast is usable for Forry and Scizor, which switches quite often on that Dialga. Anyway, standard and effective one. But I'm thinking about replacing Lum Berry on Leftovers as I have Heracross here to absorb Dark Voids.
Palkia @ Expert Belt
Ability: Pressure
EVs: 100 Atk / 156 SpA / 252 Spe
Hasty Nature (+Spe, -Def)
~ Focus Punch
~ Subtitute
~ Spacial Rend
~ Thunder
Ahhh... SubPunching Palkia. One of the best wallbreakers in Ubers and it deserves it's spot in this team. Switches on Kyogre quite comfortably, sets up Substitute and check what opponents plans to switch on me. If Blissey or Tyranitar, they're beaten up with Focus Punch. If Groudon, Spacial Rend 2OHKoes. Another Palkia is OHKoed by Spacial Rend. Thunder is mainly for Kyogre and Lugia. In other words nothing really switches safely on this guy. My favourite Palkia set.
Darkrai @ Expert Belt
Ability: Bad Dreams
EVs: 134 Atk / 176 Spe / 200 SpA
Hasty Nature (+Spe, -Def)
~ Focus Punch
~ Subtitute
~ Dark Pulse
~ Dark Void
When opponent is happy that Palkia is dead and nothing threatens in wall breaking anymore, that Darkrai comes in late game and cleans up everything remaining of the field. Those attack EVs ensures, that Blissey is OHKOed by Focus Punch. Dark Pulse is solid as always STAB, and Dark+Fight has good as always coverage. Anyway, this guy is my next wall breaker and both Palkia and Darkrai deals with heavy in defensive way teams. But I'm ready to replace that Darkrai. It's good in his job, but I guess someone may fit here a bit more.
Heracross @ Choice Scarf
Ability: Guts
EVs: 6 HP / 252 Atk / 252 Spe
Adamant Nature (+Atk, -SpA)
~ Close Combat
~ Megahorn
~ Stone Edge
~ Sleep Talk
One of the best Darkrai counters. It switches happily on Dark Void and from there kills it in one shot. Adamant Nature is neccesary, because it gives me a good shot to 2OHKO Lugia with SR up. With little prediction this guys threatens anything with only Skarmory, Forretress and Giratina effectively walling it. Heracross is solid choice for any Uber team if you need good, solid Darkrai counter. And with activated Guts hits as hard as Choice Band version. Also good and solid revenge killer.
MewTwo @ Leftovers
Ability: Pressure
EVs: 252 HP / 220 Def / 32 Spe
Timid Nature (+Spe, -Atk)
~Reflect
~ Taunt
~ Recover
~ Ice Beam
My favourite version of MewTwo and it's beastly in physical walling. No SR weakness, higher speed, fast Taunt and much stronger Ice Beam. I prefer this guy then Lugia anytime soon. Speed EVs guarrantee that I'm outspeeding +Speed Nature Garchomp. It doesn't need more. My Groudon, Rayquaza, Garchomp and Giratina counter. Some of you may ask - why Ice Beam in place of Will-O-Wisp ? Reason is simple - I need to threaten those counters as fast as possible and I dislike shaky accuracy of WoW. And in this team Ice Beam is superior choice. Even without investment MewTwo easily OHKO Rayquaza and 2OHKO most Groudons. It's more then enough. Also that MewTwo takes maximum 65% of health from Adamant Swords Danced Rayquazas ExtremeSpeed without Reflect. Good, solid wall.
Scizor @ Choice Band
Ability: Technician
EVs: 252 HP/ 56 Atk / 200 SpD
Adamant Nature (+Atk, -SpA)
~ U-Turn
~ SuperPower
~ Pursuit
~ Bullet Punch
CB Scizor and my only steel type to absorb some dragon attacks. With those EVs takes most special hits reasonably well. 56 Atk is enough to OHKO MewTwo and Latios/Latias on the switch with both U-Turn or Pursuit, if they switch out. U-Turn is great move for scouting and for easy answer for opponents moves. SuperPower is solid, fighting move, which OHKO many pokemon. Bullet Punch is much needed priority and this guy is my best switch on both Lati twins, Offensive MewTwo and Deoxys-A. Anyway, he's important member of my team being the only steel type here to absorb dragon attacks.
Anyway, here's a team. I played with it many matches and I like it alot. It works most of times and only DDQuaza sometimes trouble it, but it doesn't have many opportiunities to switch in. Sometimes SubLatios may trouble this squad, especially when Scizor is dead, but I can play around it. I hope you like this one. Cheers.

Dialga @ Lum Berry
Ability: Pressure
EVs: 252 HP / 140 SpA / 116 SpD
Modest Nature (+SpA, -Atk)
~ Stealth Rock
~ Thunder-Wave
~ Draco Meteor
~ Fire Blast
It's pretty standard lead. It sets up Stealth Rock and paralyse some foes. Draco Meteor is my choice as it OHKOes Darkrai and any Deoxys-S without Focus Sash. Lum Berry makes sure that Darkrai won't sleep me in first turn. Fire Blast is usable for Forry and Scizor, which switches quite often on that Dialga. Anyway, standard and effective one. But I'm thinking about replacing Lum Berry on Leftovers as I have Heracross here to absorb Dark Voids.

Palkia @ Expert Belt
Ability: Pressure
EVs: 100 Atk / 156 SpA / 252 Spe
Hasty Nature (+Spe, -Def)
~ Focus Punch
~ Subtitute
~ Spacial Rend
~ Thunder
Ahhh... SubPunching Palkia. One of the best wallbreakers in Ubers and it deserves it's spot in this team. Switches on Kyogre quite comfortably, sets up Substitute and check what opponents plans to switch on me. If Blissey or Tyranitar, they're beaten up with Focus Punch. If Groudon, Spacial Rend 2OHKoes. Another Palkia is OHKoed by Spacial Rend. Thunder is mainly for Kyogre and Lugia. In other words nothing really switches safely on this guy. My favourite Palkia set.

Darkrai @ Expert Belt
Ability: Bad Dreams
EVs: 134 Atk / 176 Spe / 200 SpA
Hasty Nature (+Spe, -Def)
~ Focus Punch
~ Subtitute
~ Dark Pulse
~ Dark Void
When opponent is happy that Palkia is dead and nothing threatens in wall breaking anymore, that Darkrai comes in late game and cleans up everything remaining of the field. Those attack EVs ensures, that Blissey is OHKOed by Focus Punch. Dark Pulse is solid as always STAB, and Dark+Fight has good as always coverage. Anyway, this guy is my next wall breaker and both Palkia and Darkrai deals with heavy in defensive way teams. But I'm ready to replace that Darkrai. It's good in his job, but I guess someone may fit here a bit more.

Heracross @ Choice Scarf
Ability: Guts
EVs: 6 HP / 252 Atk / 252 Spe
Adamant Nature (+Atk, -SpA)
~ Close Combat
~ Megahorn
~ Stone Edge
~ Sleep Talk
One of the best Darkrai counters. It switches happily on Dark Void and from there kills it in one shot. Adamant Nature is neccesary, because it gives me a good shot to 2OHKO Lugia with SR up. With little prediction this guys threatens anything with only Skarmory, Forretress and Giratina effectively walling it. Heracross is solid choice for any Uber team if you need good, solid Darkrai counter. And with activated Guts hits as hard as Choice Band version. Also good and solid revenge killer.

MewTwo @ Leftovers
Ability: Pressure
EVs: 252 HP / 220 Def / 32 Spe
Timid Nature (+Spe, -Atk)
~Reflect
~ Taunt
~ Recover
~ Ice Beam
My favourite version of MewTwo and it's beastly in physical walling. No SR weakness, higher speed, fast Taunt and much stronger Ice Beam. I prefer this guy then Lugia anytime soon. Speed EVs guarrantee that I'm outspeeding +Speed Nature Garchomp. It doesn't need more. My Groudon, Rayquaza, Garchomp and Giratina counter. Some of you may ask - why Ice Beam in place of Will-O-Wisp ? Reason is simple - I need to threaten those counters as fast as possible and I dislike shaky accuracy of WoW. And in this team Ice Beam is superior choice. Even without investment MewTwo easily OHKO Rayquaza and 2OHKO most Groudons. It's more then enough. Also that MewTwo takes maximum 65% of health from Adamant Swords Danced Rayquazas ExtremeSpeed without Reflect. Good, solid wall.

Scizor @ Choice Band
Ability: Technician
EVs: 252 HP/ 56 Atk / 200 SpD
Adamant Nature (+Atk, -SpA)
~ U-Turn
~ SuperPower
~ Pursuit
~ Bullet Punch
CB Scizor and my only steel type to absorb some dragon attacks. With those EVs takes most special hits reasonably well. 56 Atk is enough to OHKO MewTwo and Latios/Latias on the switch with both U-Turn or Pursuit, if they switch out. U-Turn is great move for scouting and for easy answer for opponents moves. SuperPower is solid, fighting move, which OHKO many pokemon. Bullet Punch is much needed priority and this guy is my best switch on both Lati twins, Offensive MewTwo and Deoxys-A. Anyway, he's important member of my team being the only steel type here to absorb dragon attacks.
Anyway, here's a team. I played with it many matches and I like it alot. It works most of times and only DDQuaza sometimes trouble it, but it doesn't have many opportiunities to switch in. Sometimes SubLatios may trouble this squad, especially when Scizor is dead, but I can play around it. I hope you like this one. Cheers.