How I went about it.
I started off with Raikou simply because I like his ability to sweep simply with 1 move, bar ground types.
Next I added in Suicune to compliment Raikou's weakness. Suicune takes out many of the pesky ground types that wall Raikou to hell and back.
Next I added in a strange version of Infernape, mostly for the fun of it but also to strongly weaken enemy leads. I also needed someone to set up stealth rocks, something very prevalent in OU. I decided on Infernape because of the fun moveset and his very high speed.
I had 3 pokemon but I realized that I still had many threats to deal with. One of them being Scizor. Jirachi resists Scizor nicely, letting it heal and status up. Thunderwave also ruins many sweepers and performs very well on any kind of wall.
Next I added in Metagross as a physical sweeper because I realized Blissey, a special wall, would pose many threats to me.
Finally I was down to just 1 Pokemon remaining. I went with Gliscor to help me out late game. He is able to stall many Pokemon and throw out toxic for the extra damage to turn 3HKOs into 2HKOs.
An In Depth Look
Infernape (M) @ Focus Sash
Ability: Blaze
EVs: 252 Spd/252 SpAtk
Timid nature (+Spd,-Atk)
- Endeavor
- Overheat
- Stealth Rock
- Vacuum Wave
As stated above I went with Infernape as my lead, both due to its speed for setting up stealth rocks and the unpredictability of this moveset. Stealth Rock is very easy to set up on the first turn and against opposing Azelf's I am generally outsped. This turns out to be benificail to me allowing me to endeavor on their next move. Usually it is simply an explode, something I survive due to focus sash allowing me to easily take out their switch. Another thing I often experience is a Swampert switch in. Endeavor still brings Swamperts HP down a bit due to me having such low hp. Finally I can then switch on an already weakened Swampert or proceed to endeavor if I feel it will attack.
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Jirachi @ Leftovers
Ability: Serene Grace
EVs: 252 HP/252 Def/4 SpAtk
Calm nature (+SpDef,-Atk)
- Calm Mind
- Psychic
- Thunderbolt
- Wish
Jirachi is a Pokemon I like very much and he benifits the team by being able to pass around wish and to cripple man sweepers through the use of thunderbolt. By going with a calm nature I end up with Just below 300 SpDef and Def allowing Jirachi to take both physical and special attacks.
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Suicune @ Life Orb
Ability: Pressure
EVs: 252 Spd/252 SpAtk/4 SpDef
Timid nature (+Spd,-Atk)
- Calm Mind
- Hidden Power (Electric)
- Ice Beam
- Surf
Suicune is a pretty cool Pokemon and also plays very nicely with Raikou (along with being the same legandary from that gen xD) While Raikou gets raped by many ground types Suicune comes in and takes care of them nicely.
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Gliscor (M) @ Leftovers
Ability: Hyper Cutter
EVs: 252 HP/184 Def/72 Spd
Impish nature (+Def,-SpAtk)
- Earthquake
- Roost
- Taunt
- Toxic
Gliscor is pretty cool and does pretty good to suck up physical attacks, such as Fire Punch that Jirachi can't take. Earthquake is its main STAB move doing pretty nicely against alot of pokemon, excluding flying type which can be taken out by Raikou and Suicune. Protect coupled with Toxic allow me to sit around and stall. Lastly Taunt ruins other walls and lets me stall them out with poison damage.
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Raikou @ Choice Specs
Ability: Pressure
EVs: 4 HP/252 Spd/252 SpAtk
Rash nature (+SpAtk,-SpDef)
- Aura Sphere
- Hidden Power (Ice)
- Shadow Ball
- Thunderbolt
Raikou is the pokemon I started this team around and a pretty cool pokemon easily sweeping with a simple Thunderbolt. Entry hazards may be of annoyance to him, but he won't go down easily.
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Metagross @ Life Orb
Ability: Clear Body
EVs: 60 HP/252 Atk/196 Spd
Adamant nature (+Atk,-SpAtk)
- Agility (Switch for swords dance?)
- Earthquake
- Meteor Mash
- Zen Headbutt
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Metagross is really the main physical attacker of this set and the reason why Blissey doesn't turn the whole thing upside down. Agility helps with his pitiful speed stat, further lowered by giving some EVs to HP so he can take a few hits.
Threats List
Breloom: Annoying as anything due to the lack of fire attacks, other than Infernape.
Gengar: An aggravating lead forcing Infernape to switch. Otherwise somewhat simple to deal with
Rotom-A: Levitate means that it is immune to Gliscor, my main counter to electric types. See Gengar for the ghost type part.
Scizor: Annoying as anything (as usual) However ripped apart by Gliscor and Jirachi can take bullet punch all day long.
Tyranitar: Not that bad considering that Suicune hits it hard. Sandstorm is rather aggravating for many sweepers as it shortens their time.
Closing
Sorry if I missed anything blatantly obvious as this is my first thread RMT, I checked the rules and everything seems to be ok.
Don't be afraid to give large ammounts of suggestions, I am relatively new to competetive Pokemon and anything would be helpful.