Hi! This is an update on the semi-weather team I created before, and has been tested on Showdown with an approximately 50-60% win percentage.
Team at a glance:
Tyra (Tyranitar) @ Smooth Rock / Assault Vest
Ability: Sand Stream
Sassy Nature
EVs: 252 HP / 6 Atk / 252 SpDef
-Stealth Rock
-Pursuit/Crunch
-Earthquake
-Ice Beam
My tank-lead and hazard-setter. Tyranitar is scary enough to induce a switch, giving it a free turn to set up Stealth Rock. If a switch is correctly predicted Tyranitar can opt instead to deal heavy damage with Pursuit for heavy damage (and an instant kill on Magic Bounce Espeon). This thing is a special tank, and with its bulk and Sandstorm up it can tank even Super-Effective Special Attacks. Earthquake and Ice Beam (this one's for you Gliscor) provide coverage against multiple threats, particularly Flying and Fire-types, which are common. Another option is the super-special wall Assault Vest build, at the cost of Stealth Rock, which has been useful against Talonflame, Charizard and other Flying-types. It's kinda slow though, but I prioritized bulk to keep it alive and change the weather when needed in order to set the stage for:
Lester (Excadrill) @ Air Balloon/Soft Sand
Ability: Sand Rush
Adamant Nature
EVs: 6 HP / 252 Atk / 252 Spe
-Swords Dance
-Earthquake
-Rock Slide / Shadow Claw
-Rapid Spin
My sweeping Rapid Spinner. Excadrill's drop from Uber to OU has given OU access to one of the best spinners around. Has been successful in piling on the pressure early on, with the threat of an early-game sweep always looming. EQ with Rock Slide is a great coverage combo for Excadrill, Swords Dance is there to take advantage of when the opponent switches, and Sand Rush ensures that, barring priority, Excadrill will go first almost all the time as long as Sand is up. A +2 EQ will sweep most teams, but the lack of Mold Breaker is kind of a dilemma. Soft Sand has also been useful, as even unboosted Earthquakes deal massive damage to non-levitating opponents.
Jiminy Steel (Scizor) @ Choice Band
Ability: Technician
Adamant Nature
EVs: 252 HP / 252 Atk / 6 SpDef
-Bullet Punch
-U-turn
-Pursuit
-Brick Break
The first half of my Volt-Turn core. This is a typical Choice Band Scizor set geared for pure offense, with enough bulk to absorb one or two hits before hitting back with Bullet Punch. It hits hard enough to OHKO or 2HKO most non-walls in the tier, and its only weakness, Fire, is covered by both Tyranitar and Excadrill. Scizor is also the designated Fairy-killer, and provides much needed coverage with its plethora of attacks. Pursuit has been one of the most useful moves so far, as many weakened mons that threaten to switch out have fallen to Scizor. The build lacks longevity though, and I am thinking of changing the build to a Bulky Swords Dance Build or to a Bulky Choice Band build.
Mr. Clean (Rotom-W) @ Leftovers/Light Clay
Ability: Levitate
Bold Nature
EVs: 252 HP / 252 Def / 6 SpAtk
-Hydro Pump
-Volt Switch
-Reflect
-Light Screen
The physical tank and reliable screener in the team, and the MVP of the team so far. Walls Talonflame,provides support for Scizor against Fire-types and is basically the physical wall of the team. Rotom-W can come into the game via U-turn, set-up screens during the opponent's switch, and then Volt Switch away to deal STAB damage while switching with a sweeper, who is now protected by one or two screens. Leftovers gives Rotom-W longevity and a reliable means of recovery in order for it to be able to take more hits, but this can also be switched with Light Clay in order to maximize use of the dual screens. An Assault Vest set (Modest Nature) with Thunderbolt and Shadow Ball instead of dual screens is also an option for my team in order to pile on offensive pressure.
Mister Swabe (Alakazam) @ Focus Sash
Ability: Magic Guard
Timid Nature
EVs: 6 HP / 252 SpAtk / 252 Spe
-Psyshock
-Energy Ball
-Shadow Ball
-Focus Blast
The team's special attacker and special revenge sweeper. Magic Guard protects against Tyranitar's sandstorm and from any entry hazards on the field. Timid nature is to outspeed as many Pokémon as possible, and the Focus Sash ensures that Alakazam will be able to hit at least once even if the opponent has priority. Psyshock was chosed over Psychic in order to provide a means to damage the physical side of opponents, while Focus Blast, Shadow Ball and Energy Ball are there for coverage. EVs are basic, max Special Attack and max Speed to deal heavy damage as quick as possible. The Focus Sash has proven to be extremely useful, and switching in Alakazam allows me to at the very least dent an enemy Pokemon.
Visenya (Salamence) @ Life Orb
Ability: Moxie
Naive Nature
EVs: 252 Atk / 6 SpAtk / 252 Spe
-Dragon Dance
-Dragon Claw
-Earthquake
-Fire Blast
The main sweeper of the team. Salamence was selected over Garchomp because of its Flying-type and resistance to the ever-present Earthquake. Naive nature was chosen for maximum speed, and after a Dragon Dance the only thing that will bring this 'mon down is priority or status. Moxie allows set-up while revenge killing, and stacked Attack boosts enables quick sweeping. Fire Blast and Earthquake are for coverage, while Dragon Claw serves as the main STAB move. Other options include Tauntrados or Garchomp.
This team is great at pressuring other offensive teams, but has had difficulty in eliminating stall teams that rely on status. This has been my most successful team in Showdown OU so far, but I think the team can still be improved a lot. Suggestions are most welcome.
Team at a glance:







Tyra (Tyranitar) @ Smooth Rock / Assault Vest
Ability: Sand Stream
Sassy Nature
EVs: 252 HP / 6 Atk / 252 SpDef
-Stealth Rock
-Pursuit/Crunch
-Earthquake
-Ice Beam
My tank-lead and hazard-setter. Tyranitar is scary enough to induce a switch, giving it a free turn to set up Stealth Rock. If a switch is correctly predicted Tyranitar can opt instead to deal heavy damage with Pursuit for heavy damage (and an instant kill on Magic Bounce Espeon). This thing is a special tank, and with its bulk and Sandstorm up it can tank even Super-Effective Special Attacks. Earthquake and Ice Beam (this one's for you Gliscor) provide coverage against multiple threats, particularly Flying and Fire-types, which are common. Another option is the super-special wall Assault Vest build, at the cost of Stealth Rock, which has been useful against Talonflame, Charizard and other Flying-types. It's kinda slow though, but I prioritized bulk to keep it alive and change the weather when needed in order to set the stage for:

Lester (Excadrill) @ Air Balloon/Soft Sand
Ability: Sand Rush
Adamant Nature
EVs: 6 HP / 252 Atk / 252 Spe
-Swords Dance
-Earthquake
-Rock Slide / Shadow Claw
-Rapid Spin
My sweeping Rapid Spinner. Excadrill's drop from Uber to OU has given OU access to one of the best spinners around. Has been successful in piling on the pressure early on, with the threat of an early-game sweep always looming. EQ with Rock Slide is a great coverage combo for Excadrill, Swords Dance is there to take advantage of when the opponent switches, and Sand Rush ensures that, barring priority, Excadrill will go first almost all the time as long as Sand is up. A +2 EQ will sweep most teams, but the lack of Mold Breaker is kind of a dilemma. Soft Sand has also been useful, as even unboosted Earthquakes deal massive damage to non-levitating opponents.

Jiminy Steel (Scizor) @ Choice Band
Ability: Technician
Adamant Nature
EVs: 252 HP / 252 Atk / 6 SpDef
-Bullet Punch
-U-turn
-Pursuit
-Brick Break
The first half of my Volt-Turn core. This is a typical Choice Band Scizor set geared for pure offense, with enough bulk to absorb one or two hits before hitting back with Bullet Punch. It hits hard enough to OHKO or 2HKO most non-walls in the tier, and its only weakness, Fire, is covered by both Tyranitar and Excadrill. Scizor is also the designated Fairy-killer, and provides much needed coverage with its plethora of attacks. Pursuit has been one of the most useful moves so far, as many weakened mons that threaten to switch out have fallen to Scizor. The build lacks longevity though, and I am thinking of changing the build to a Bulky Swords Dance Build or to a Bulky Choice Band build.

Mr. Clean (Rotom-W) @ Leftovers/Light Clay
Ability: Levitate
Bold Nature
EVs: 252 HP / 252 Def / 6 SpAtk
-Hydro Pump
-Volt Switch
-Reflect
-Light Screen
The physical tank and reliable screener in the team, and the MVP of the team so far. Walls Talonflame,provides support for Scizor against Fire-types and is basically the physical wall of the team. Rotom-W can come into the game via U-turn, set-up screens during the opponent's switch, and then Volt Switch away to deal STAB damage while switching with a sweeper, who is now protected by one or two screens. Leftovers gives Rotom-W longevity and a reliable means of recovery in order for it to be able to take more hits, but this can also be switched with Light Clay in order to maximize use of the dual screens. An Assault Vest set (Modest Nature) with Thunderbolt and Shadow Ball instead of dual screens is also an option for my team in order to pile on offensive pressure.

Mister Swabe (Alakazam) @ Focus Sash
Ability: Magic Guard
Timid Nature
EVs: 6 HP / 252 SpAtk / 252 Spe
-Psyshock
-Energy Ball
-Shadow Ball
-Focus Blast
The team's special attacker and special revenge sweeper. Magic Guard protects against Tyranitar's sandstorm and from any entry hazards on the field. Timid nature is to outspeed as many Pokémon as possible, and the Focus Sash ensures that Alakazam will be able to hit at least once even if the opponent has priority. Psyshock was chosed over Psychic in order to provide a means to damage the physical side of opponents, while Focus Blast, Shadow Ball and Energy Ball are there for coverage. EVs are basic, max Special Attack and max Speed to deal heavy damage as quick as possible. The Focus Sash has proven to be extremely useful, and switching in Alakazam allows me to at the very least dent an enemy Pokemon.

Visenya (Salamence) @ Life Orb
Ability: Moxie
Naive Nature
EVs: 252 Atk / 6 SpAtk / 252 Spe
-Dragon Dance
-Dragon Claw
-Earthquake
-Fire Blast
The main sweeper of the team. Salamence was selected over Garchomp because of its Flying-type and resistance to the ever-present Earthquake. Naive nature was chosen for maximum speed, and after a Dragon Dance the only thing that will bring this 'mon down is priority or status. Moxie allows set-up while revenge killing, and stacked Attack boosts enables quick sweeping. Fire Blast and Earthquake are for coverage, while Dragon Claw serves as the main STAB move. Other options include Tauntrados or Garchomp.
This team is great at pressuring other offensive teams, but has had difficulty in eliminating stall teams that rely on status. This has been my most successful team in Showdown OU so far, but I think the team can still be improved a lot. Suggestions are most welcome.