This team 5-0ed Regarde / Bulldogs so it must be good! (sarcasm!!)

Edit: fine 4-0 up yours bulldogs

@ Lum Berry
252 HP / 216 Special Defense / 40 Speed

Brave Bird

I used to have Metagross here as he is capable of beating all major leads barring Infernape / Heatran / Skarmory / Forretress, but the terrible, terrible threat of Shaymin has forced me to run a better check. Still, Skarmory does very well as a lead. Agains Azelf I switch right to Tyranitar who will either get Taunted and throw a Payback at it or eat a Fire Blast / Trick and lay rocks. Machamp will usually kill Skarmory in two hits, but not before I get a layer of Spikes and a Brave Bird on it. Lum Berry lets me stay in against Smeargle and Roserade and Taunt their sleep move. Though I can Taunt Swampert and Metagross I usually don't as they often switch right to a Heatran / random other counter.

@ Choice Specs
252 Special Attack / 252 Speed / 4 Defense

Draco Meteor
HP Electric

Kingdra is a destructive monster with about 91% the Special Attack of Choice Specs Latias, yet Kingdra's Surf is 36% stronger. Max speed allows me to at worst tie with enemy Suicune and also outrun every single standard Kingdra set in OU as well as Adamant Lucario, Mamoswine, Scizor and Gyarados. Yawn is mostly filler but its convenient for at worst putting something to sleep (usually in an emergency situation) or at best racking up tons of Spikes and Stealth Rocks damage. To give you an idea of the massive destructive potential of Kingdra, offensive Suicune is always OHKOed by Draco Meteor after Stealth Rocks and a turn of Sandstorm. HP Electric is cool for situations where I'm against a Skarmory and I know they have a Gyarados or Starmie waiting so I can hit them hard no matter what. Also it hits Empoleon!

@ Shuca Berry
252 Attack / 60 Speed / 196 HP

Close Combat
Ice Punch
Swords Dance

Shuca Berry and HP EVs lets Lucario survive any Earthquake in OU weaker than Mamoswines CB hits, and any neutral attacks weaker than that. Zapdos Heat Wave also fails to KO, allowing Lucario to take down most of his counters. HP EV bulk gives me either a free hit against things like Gliscor, Flygon and Zapdos (Ice Punch + ES KOs all three) or lets me get a second Swords Dance in ideal situations which adds up to 115% what +2 LO Lucario reaches giving me some added OHKOs.

@ Lum Berry
252 HP / 252 Special Defense / 4 Special Attack

Fire Blast
Stealth Rock

A horrifying combination of a lure and support pokemon. Payback OHKOs Azelf and 2HKOs anything weak to it. Fire Blast is chosen over Flamethrower for its ability to OHKO Specially Defensive Forretress and Breloom after Stealth Rocks while 2HKOing all Skarmory, something Flamethrower can't. Fire Blast does enough to enemy Lucario that they are in KO range for just about any attack on my team. Stealth Rocks is obligatory on any team while Rest keeps me alive. Lum Berry works as a Chesto-Rest combo and turns the tide on Spore / Toxic Spikes / Will-O-Wisp. Special Defense EVs and Sandstorm boost gives Tyranitar so much Special Defense he ends up with just 2% less than Bold Blissey, letting him stand his ground in the face of even HP Fighting. Payback does surprising amounts of damage even with no Attack EVs. For example, its more powerful than Jolly Scarf Flygon's Earthquake. This lets it keep up a moderate amount of offensive pressure against things like Crocune (possible 2HKO on offensive versions) or Gyarados (2HKO after rocks and intimidate).

@ Life Orb
252 Special Attack / 252 Speed / 4 Defense

Shadow Ball
Focus Blast
Pain Split

My primary switch in for Shaymin. Gengar can survive any Life Orbed hit and retaliate with a Pain Split, gaining back enough HP to survive the next blow and retaliate with a now lethal Shadow Ball. Not to mention Sub Pain Split Gengar sweeps teams. Gengar can handle Lucario and Infernape well enough but also beats Scizor. If I sub as Scizor comes in I can Pain Split back to full health, putting Scizor into KO range for Focus Blast. Gengar forces tons of switches as well as being a decent spin blocker. Gengar is standard and boring and no one ever lets it set up a substitute, so maybe drop Substitute for Hypnosis or Will-O-Wisp.

@ Choice Scarf
144 Speed / 252 Attack / 108 Defense

Thunder Punch

Revenge killer, not much to say. It spreads tons of Spikes damage by forcing Pokemon to flee, only to make them flee again when they take a U-turn and watch me send in a counter. Thunder Punch strikes Gyarados down, doing 101 minimum while also doing decent damage against some things like Skarmory, Vaporeon, Suicune and Gengar that I don't want to use Outrage on. +2 Lucario ES does 91% max so I guess this is kind of a check to it. Outruns Scarf Rotom and the rest went into bulk. I guess I lose out on other Flygon but at least I win a U-turn war this way.

Anyway I'm extremely weak to Lucario since Gengar pretty much always dies or Focus Blast misses. Maybe I'll drop Kingdra for an offensive Jolly Taunt Gyarados (my favorite set) or some kind of Suicune. I can also drop Gengar for a Gliscor but.. Gliscor doesn't really do anything.

I also pretty much instantly lose to Agility Metagross if things are weakened enough (though I'm not quite 6-0ed, its just a pain).