There wasn't a real "teambuilding" process (I'm relatively new to Gen 6 OU + I chose Pokemon I liked that work well together), so I'll just get on with the team and their respective descriptions.
From a first glance, this team comes off as a very anti-stall team, ultimately, as only one Pokemon can get worn down by Toxic (Greninja) and most shrug off status conditions. But this is simply a passive bonus which exists on the team, and I believe there are several hidden surprises present on it, which your average battler would not take/use. Anyway...here it is (long descriptions below!).
The Team:
With this set, I use Bisharp to act as a Revenge Killer (it's the only Pokemon with priority on the team) as well as a Set-Up sweeper. Now, one may be thinking: "Life Orb > Chople Berry"...but realistically, we all know that Bisharp can even get OHKO'd by a simple Mach Punch. Thus, when Conkeldurr goes for the simple Mach Punch to try and KO Bisharp, Bisharp can at least endure one hit so that it can wear down its opponent before its eventual death. However, for this purpose, I use Bisharp as a Late-Game Sweeper, where the already worn down bulky Pokemon fall at the hands of Bisharp. Anyway, here's some calcs against Conkeldurr & other Fighting-types:
252+ Atk Bisharp Iron Head vs. 252 HP / 0 Def Conkeldurr: 145-172 (35 - 41.5%) -- guaranteed 3HKO
252+ Atk Conkeldurr Mach Punch vs. 4 HP / 0 Def Chople Berry Bisharp: 152-182 (55.8 - 66.9%) -- guaranteed 2HKO
252 Atk Life Orb Technician Breloom Mach Punch vs. 4 HP / 0 Def Chople Berry Bisharp: 257-304 (94.4 - 111.7%) -- 68.8% chance to OHKO
252+ Atk Bisharp Iron Head vs. 4 HP / 0 Def Breloom: 169-199 (64.5 - 75.9%) -- guaranteed 2HKO
It's evident that the Chople Berry is not far superior or inferior to the Life Orb, but it's running fine at the moment.
Seisatto (Greninja) (M) @ Choice Specs
Ability: Protean
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Hydro Pump
- Ice Beam
- Grass Knot
- Dark Pulse
Having a lot of 1v1 experience with Greninja (I reached #4 on the PS ladder with him alone), I'm aware that Greninja can carry quite the punch, and, with its already sur-par speed, I put Choice Specs on him. In terms of moveset, I particularly dislike the accuracy of Hydro Pump, but still use it regardless because of the things it can do:
252 SpA Choice Specs Greninja Hydro Pump vs. 252 HP / 252+ SpD Heatran: 318-374 (82.3 - 96.8%) -- 62.5% chance to OHKO after Stealth Rock
252 SpA Choice Specs Greninja Hydro Pump vs. 4 HP / 0 SpD Mega Charizard Y in Sun: 204-240 (68.4 - 80.5%) -- guaranteed 2HKO
252 SpA Choice Specs Protean Greninja Ice Beam vs. 4 HP / 0 SpD Multiscale Dragonite: 374-444 (115.4 - 137%) -- guaranteed OHKO
252 SpA Choice Specs Protean Greninja Grass Knot (120 BP) vs. 4 HP / 0 SpD Mega Gyarados: 398-470 (119.8 - 141.5%) -- guaranteed OHKO
Anyway, you may say that this limits Greninja's versatility, but the sheer force of the set covers this as Greninja absolutely destroys some Pokemon with its Choice Specs. In addition, the coverage of Greninja is generally broad, and so is this set. This reasoning made it an easy decision for me to put Greninja on my team.
Dumas (Breloom) @ Toxic Orb
Ability: Poison Heal
EVs: 252 Def / 248 HP / 8 Atk
Impish Nature
- Spore
- Focus Punch
- Leech Seed
- Substitute
To begin with, watch this replay: http://replay.pokemonshowdown.com/ou-112767351 You can say that I predicted very well in the game or my opponent was bad, but this is real proof of the potential this Breloom set has. While this set gets completely shut down by a Pokemon like Trevenant, this set also shuts down a Pokemon like Trevenant, making the opponent switch-out while Breloom gets a free sub to work with. And from there, the strategy is fairly simple: Spore, Sub (if it's broken) and then Punch/Seed depending on the situation. Obviously, this set lacks a Grass-type attack, which means it cannot OHKO Rotom-W, but the opponent is unaware of the set. This provides the free move off the bat, basically. Another thing the replay shows is the ability to tank a Latios' SE attack. This just says something about Breloom's bulk. Seriously. Breloom also has the ability to switch in on Ground-type moves with ease, while providing an offensive presence to the Pokemon it is battling.
Kamikaze (Skarmory) @ Leftovers
Ability: Sturdy
EVs: 232 Def / 252 HP / 24 Spd
Impish Nature
- Stealth Rock
- Taunt
- Brave Bird
- Roost
Oh no, a support-Skarmory, just like most people who use Skarmory. Ah, but two things define this Skarmory from most others: a) Taunt b) The fact that I use Brave Bird before even using Stealth Rock at times. A) is very useful on Skarmory as it forces a Pokemon like Talonflame to attack with recoil while Skarmory recovers with Roost. Then, b) is useful in the way that it catches people off-guard, as I seriously like to hammer an opponent instead of throwing out a hazard like most people do. But other than this, Skarmory's main purpose is to wall and remove set-up sweepers (which are mainly physical).
Amphy (Ampharos) @ Ampharosite
Ability: Static
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Dragon Pulse
- Rest
- Sleep Talk
- Thunderbolt
Similarly to how I had 1v1 experience with Greninja, I can say that from UU experience, I know how to use Ampharos-Mega effectively, even if it takes greater damage in OU. It also provides the only true Fire-resistance for the team, and Fire-types are a huge threat (sorry Greninja). However, switching in un-mega'd is a highly risky thing to do, especially if the things it normally switches in on have ridiculous power. On the other hand, when it gets up and running, it becomes an efficient sweeper, 2HKO'ing most OU-mons while also having decent recovery with Rest. Here are some calcs against main threats to my team:
252 SpA Heatran Earth Power vs. 252 HP / 4 SpD Mega Ampharos: 180-214 (46.8 - 55.7%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 252 HP / 0 Def Mega Ampharos: 366-432 (95.3 - 112.5%) -- 75% chance to OHKO
252+ Atk Mega Charizard X Earthquake vs. 252 HP / 0 Def Ampharos: 274-324 (71.3 - 84.3%) -- guaranteed 2HKO
(This build OHKOs Mega-Char-X w/Dragon Pulse, even in un-mega'd form.)
252+ Atk Teravolt Kyurem-B Outrage vs. 252 HP / 0 Def Mega Ampharos: 506-596 (131.7 - 155.2%) -- guaranteed OHKO
252+ Atk Teravolt Kyurem-B Outrage vs. 252 HP / 0 Def Ampharos: 301-355 (78.3 - 92.4%) -- guaranteed 2HKO
Anyway, from these calculations, it becomes evident that sometimes it is best to keep Mega-Ampharos as a normal Ampharos so that it can deal some damage to its foes without getting OHKO'd. Once again, this decision is ultimately unpredictable, which creates some confusion in an opponent's mind.
Espurrloin (Espeon) @ Choice Specs
Ability: Magic Bounce
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Trick
- Dazzling Gleam
- Shadow Ball
- Psyshock
And now, for the final member of my team: Espeon. In my honest opinion, Espeon has saved me many times with it's sweeping potential when it uses Choice Specs (even though it is very terrible against Heatran and Bisharp). Unlike Greninja, Espeon is an opportunistic sweeper, due to Magic Bounce (which also forces a switch for the opponent at times), and because of this, I use Choice Specs on Espeon so that it can deal out as much damage as it can when the opponent switches Pokemon, making the opponent already weakened for the rest of the battle.
Threats/Problems:
Fire-types [especially Darmanitan, Infernape, Heatran]
So far this team has taken me to a ranking of 1441 on Pokemon Showdown with 43 wins and 21 losses.
Brief Introduction:






From a first glance, this team comes off as a very anti-stall team, ultimately, as only one Pokemon can get worn down by Toxic (Greninja) and most shrug off status conditions. But this is simply a passive bonus which exists on the team, and I believe there are several hidden surprises present on it, which your average battler would not take/use. Anyway...here it is (long descriptions below!).
The Team:

Kotetsu (Bisharp) (M) @ Chople Berry
Ability: Defiant
Shiny: Yes
EVs: 252 Spd / 252 Atk / 4 HP
Jolly Nature
- Substitute
- Iron Head
- Sucker Punch
- Swords Dance
Ability: Defiant
Shiny: Yes
EVs: 252 Spd / 252 Atk / 4 HP
Jolly Nature
- Substitute
- Iron Head
- Sucker Punch
- Swords Dance
With this set, I use Bisharp to act as a Revenge Killer (it's the only Pokemon with priority on the team) as well as a Set-Up sweeper. Now, one may be thinking: "Life Orb > Chople Berry"...but realistically, we all know that Bisharp can even get OHKO'd by a simple Mach Punch. Thus, when Conkeldurr goes for the simple Mach Punch to try and KO Bisharp, Bisharp can at least endure one hit so that it can wear down its opponent before its eventual death. However, for this purpose, I use Bisharp as a Late-Game Sweeper, where the already worn down bulky Pokemon fall at the hands of Bisharp. Anyway, here's some calcs against Conkeldurr & other Fighting-types:
252+ Atk Bisharp Iron Head vs. 252 HP / 0 Def Conkeldurr: 145-172 (35 - 41.5%) -- guaranteed 3HKO
252+ Atk Conkeldurr Mach Punch vs. 4 HP / 0 Def Chople Berry Bisharp: 152-182 (55.8 - 66.9%) -- guaranteed 2HKO
252 Atk Life Orb Technician Breloom Mach Punch vs. 4 HP / 0 Def Chople Berry Bisharp: 257-304 (94.4 - 111.7%) -- 68.8% chance to OHKO
252+ Atk Bisharp Iron Head vs. 4 HP / 0 Def Breloom: 169-199 (64.5 - 75.9%) -- guaranteed 2HKO
It's evident that the Chople Berry is not far superior or inferior to the Life Orb, but it's running fine at the moment.

Seisatto (Greninja) (M) @ Choice Specs
Ability: Protean
Shiny: Yes
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Hydro Pump
- Ice Beam
- Grass Knot
- Dark Pulse
Having a lot of 1v1 experience with Greninja (I reached #4 on the PS ladder with him alone), I'm aware that Greninja can carry quite the punch, and, with its already sur-par speed, I put Choice Specs on him. In terms of moveset, I particularly dislike the accuracy of Hydro Pump, but still use it regardless because of the things it can do:
252 SpA Choice Specs Greninja Hydro Pump vs. 252 HP / 252+ SpD Heatran: 318-374 (82.3 - 96.8%) -- 62.5% chance to OHKO after Stealth Rock
252 SpA Choice Specs Greninja Hydro Pump vs. 4 HP / 0 SpD Mega Charizard Y in Sun: 204-240 (68.4 - 80.5%) -- guaranteed 2HKO
252 SpA Choice Specs Protean Greninja Ice Beam vs. 4 HP / 0 SpD Multiscale Dragonite: 374-444 (115.4 - 137%) -- guaranteed OHKO
252 SpA Choice Specs Protean Greninja Grass Knot (120 BP) vs. 4 HP / 0 SpD Mega Gyarados: 398-470 (119.8 - 141.5%) -- guaranteed OHKO
Anyway, you may say that this limits Greninja's versatility, but the sheer force of the set covers this as Greninja absolutely destroys some Pokemon with its Choice Specs. In addition, the coverage of Greninja is generally broad, and so is this set. This reasoning made it an easy decision for me to put Greninja on my team.

Dumas (Breloom) @ Toxic Orb
Ability: Poison Heal
EVs: 252 Def / 248 HP / 8 Atk
Impish Nature
- Spore
- Focus Punch
- Leech Seed
- Substitute
To begin with, watch this replay: http://replay.pokemonshowdown.com/ou-112767351 You can say that I predicted very well in the game or my opponent was bad, but this is real proof of the potential this Breloom set has. While this set gets completely shut down by a Pokemon like Trevenant, this set also shuts down a Pokemon like Trevenant, making the opponent switch-out while Breloom gets a free sub to work with. And from there, the strategy is fairly simple: Spore, Sub (if it's broken) and then Punch/Seed depending on the situation. Obviously, this set lacks a Grass-type attack, which means it cannot OHKO Rotom-W, but the opponent is unaware of the set. This provides the free move off the bat, basically. Another thing the replay shows is the ability to tank a Latios' SE attack. This just says something about Breloom's bulk. Seriously. Breloom also has the ability to switch in on Ground-type moves with ease, while providing an offensive presence to the Pokemon it is battling.

Kamikaze (Skarmory) @ Leftovers
Ability: Sturdy
EVs: 232 Def / 252 HP / 24 Spd
Impish Nature
- Stealth Rock
- Taunt
- Brave Bird
- Roost
Oh no, a support-Skarmory, just like most people who use Skarmory. Ah, but two things define this Skarmory from most others: a) Taunt b) The fact that I use Brave Bird before even using Stealth Rock at times. A) is very useful on Skarmory as it forces a Pokemon like Talonflame to attack with recoil while Skarmory recovers with Roost. Then, b) is useful in the way that it catches people off-guard, as I seriously like to hammer an opponent instead of throwing out a hazard like most people do. But other than this, Skarmory's main purpose is to wall and remove set-up sweepers (which are mainly physical).

Amphy (Ampharos) @ Ampharosite
Ability: Static
EVs: 252 SAtk / 252 HP / 4 SDef
Modest Nature
- Dragon Pulse
- Rest
- Sleep Talk
- Thunderbolt
Similarly to how I had 1v1 experience with Greninja, I can say that from UU experience, I know how to use Ampharos-Mega effectively, even if it takes greater damage in OU. It also provides the only true Fire-resistance for the team, and Fire-types are a huge threat (sorry Greninja). However, switching in un-mega'd is a highly risky thing to do, especially if the things it normally switches in on have ridiculous power. On the other hand, when it gets up and running, it becomes an efficient sweeper, 2HKO'ing most OU-mons while also having decent recovery with Rest. Here are some calcs against main threats to my team:
252 SpA Heatran Earth Power vs. 252 HP / 4 SpD Mega Ampharos: 180-214 (46.8 - 55.7%) -- guaranteed 2HKO after Stealth Rock
252+ Atk Tough Claws Mega Charizard X Dragon Claw vs. 252 HP / 0 Def Mega Ampharos: 366-432 (95.3 - 112.5%) -- 75% chance to OHKO
252+ Atk Mega Charizard X Earthquake vs. 252 HP / 0 Def Ampharos: 274-324 (71.3 - 84.3%) -- guaranteed 2HKO
(This build OHKOs Mega-Char-X w/Dragon Pulse, even in un-mega'd form.)
252+ Atk Teravolt Kyurem-B Outrage vs. 252 HP / 0 Def Mega Ampharos: 506-596 (131.7 - 155.2%) -- guaranteed OHKO
252+ Atk Teravolt Kyurem-B Outrage vs. 252 HP / 0 Def Ampharos: 301-355 (78.3 - 92.4%) -- guaranteed 2HKO
Anyway, from these calculations, it becomes evident that sometimes it is best to keep Mega-Ampharos as a normal Ampharos so that it can deal some damage to its foes without getting OHKO'd. Once again, this decision is ultimately unpredictable, which creates some confusion in an opponent's mind.

Espurrloin (Espeon) @ Choice Specs
Ability: Magic Bounce
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Trick
- Dazzling Gleam
- Shadow Ball
- Psyshock
And now, for the final member of my team: Espeon. In my honest opinion, Espeon has saved me many times with it's sweeping potential when it uses Choice Specs (even though it is very terrible against Heatran and Bisharp). Unlike Greninja, Espeon is an opportunistic sweeper, due to Magic Bounce (which also forces a switch for the opponent at times), and because of this, I use Choice Specs on Espeon so that it can deal out as much damage as it can when the opponent switches Pokemon, making the opponent already weakened for the rest of the battle.
Threats/Problems:
Fire-types [especially Darmanitan, Infernape, Heatran]
So far this team has taken me to a ranking of 1441 on Pokemon Showdown with 43 wins and 21 losses.