I agree with Remedy (although it wasn't explicitly stated) that it would be best to choose the win condition for Team 2 with the first of the two final picks. Heracross and Mamoswine are countered by Bronzong, Skarmory and, to some extent, Forretress however each has their own advantages and disadvantages that deciding on which would be best to choose will depend on the win condition. However, they are still worth keeping in mind as, ideally, we should choose a win condition who's counters are answered by a combination of one of these three and the rest of the team. (while avoiding to push them into an undesirable choice like Deo-D) Since Team 2 has absolute freedom in their final pick it is impossible to pick a sweeper that make completely one-sided. So, the best we can do is pick a Pokemon that threatens every member of Team 1's current match-up, is flexible when it comes to sweeping and who lacks any hard counters. Terrakion @ Life Orb Trait: Justified EVs: 252 Atk / 252 Spd / 4 Def Jolly Nature - Close Combat - Stone Edge - Swords Dance - Substitute What does this set do? Terrakion has been one of the most fearsome sweepers in OU since the beginning of the 5th generation. With near perfect STAB's and the ideal stat distribution for a sweeper in OU it comes as no surprise that he has been given a S rank in the OU Viability Thread. SubSD Terrakion showcases the immense flexibility given to Terrakion thanks to already excellent coverage granted by his Rock-Fighting STABs alone. Sword Dance lets Terrakion double his attack to break through even the sturdiest of physical walls and put gaping holes in the opponent's team. Substitute is a cool idea suggested by Remedy that plays basically the same way as Rock Polish would as Terrakion already outruns the entire Team 1 except for Heracross. (You can see the reasoning behind this choice in this post) Which is the best to use depends on the team and situation. Life Orb is is a general item that gives him a boost in power so that he can accomplish either one of these sweeps. Calcs (Move your mouse to reveal the content) Calcs (open) Calcs (close) 252 Atk Life Orb Terrakion Close Combat vs. 252 HP / 64 Def Kyurem-B: 476-562 (104.84 - 123.78%) -- guaranteed OHKO 252 Atk Life Orb Terrakion Close Combat vs. 248 HP / 112 Def Rotom-W: 216-255 (71.28 - 84.15%) -- guaranteed 2HKO +2 252 Atk Life Orb Terrakion Close Combat vs. 248 HP / 112 Def Rotom-W: 430-507 (141.91 - 167.32%) -- guaranteed OHKO 252 Atk Life Orb Terrakion Stone Edge vs. 64 HP / 0 Def Landorus: 231-273 (68.95 - 81.49%) -- guaranteed 2HKO +2 252 Atk Life Orb Terrakion Stone Edge vs. 64 HP / 0 Def Landorus: 461-543 (137.61 - 162.08%) -- guaranteed OHKO 252 Atk Life Orb Terrakion Stone Edge vs. 0 HP / 0 Def Heracross: 269-317 (89.36 - 105.31%) -- guaranteed OHKO after Stealth Rock 252 Atk Life Orb Terrakion Close Combat vs. 0 HP / 4 Def Mamoswine: 608-717 (168.42 - 198.61%) -- guaranteed OHKO How can this set help the team? Terrakion is Team 2's win condition and a very terrifying one at that. Even without any sort of boost he threatens to OHKO almost the entire team. This means that he will be forcing a LOT of switches which will be an opportunity to Substitute and sweep past the Scarf Heracross or SD to wall break whatever counter is chosen as the final pick. His resistance to SR is also very important as Cube's DTail will undoubtedly shuffle Team 2 around a bit. It also means he can switch-in multiple times to help soften up the OP's team himself. What can the other team do in response to this set? Although there may not be any hard counters to Terrakion there are still some that will force Team 2 to play a bit smarter if they want to successfully sweep. Slowbro, Gliscor, and Hippowdon are the best counters to Terrakion as they can tank all tank a +2 attack while attacking back with their SE STAB attack. Scizor is also worth mentioning as, although it may not be able to switch safely into Terrakion, it's almighty Bullet Punch allows it cut off its sweep if Terrakion isn't hiding behind a Substitute while also having excellent synergy with the rest of Team 1. Why Terrakion lacks hard counters (Move your mouse to reveal the content) Why Terrakion lacks hard counters (open) Why Terrakion lacks hard counters (close) +2 252 Atk Life Orb Terrakion Stone Edge vs. 252 HP / 252+ Def Slowbro: 286-337 (72.58 - 85.53%) -- guaranteed 2HKO 4 SpA Slowbro Psychic vs. 0 HP / 0 SpD Terrakion: 212-252 (65.63 - 78.01%) -- guaranteed 2HKO +2 252 Atk Life Orb Terrakion Stone Edge vs. 252 HP / 252+ Def Gliscor: 261-308 (73.72 - 87%) -- guaranteed 2HKO 0 Atk Gliscor Earthquake vs. 0 HP / 4 Def Terrakion: 224-266 (69.34 - 82.35%) -- guaranteed 2HKO +2 252 Atk Life Orb Terrakion Close Combat vs. 252 HP / 244+ Def Hippowdon: 328-386 (78.09 - 91.9%) -- guaranteed 2HKO 0 Atk Hippowdon Earthquake vs. -1 0 HP / 4 Def Terrakion: 386-456 (119.5 - 141.17%) guaranteed OHKO What potential additions can be made to deal with these responses? The only potential responses are the three mentioned earlier. Fortunately, the two stronger counters to Heracross and Mamoswine are the two best answers to the checks/counters to Terrakion. Bronzong has nothing to fear from Gliscor or Hippowdon while taking minimal damage from Mamoswine and being a general nuisance to Team 1. Skarmory shuts down Gliscor and Hippowdon as well as laughing at any of Scizor's attacks and boasting reliable recovery. Slowbro is already hard countered by Celebii so these two don't have to worry about dealing with him.