This is my first Pokebank team, so forgive me please if any pokemon can be outclassed by another. Also, I never really used to play OU, as I found Uber more entertaining. This has worked pretty well for me!
Sharpedo @ Sharpedonite
Ability: Speed Boost
EVs: 252 Attack/ 4SpDef / 252 Speed
Nature: Adamant
Waterfall | Poison Jab | Ice Fang | Protect
I gave Sharpedo an Adamant nature because of the Speed Boost ability. This will give it the maximum attack it can have, since it already will be getting a +1 in speed. Waterfall is for the (let's be honest. If scald burn is said to be 30% and it burns every single time the 20% flinch isn't that bad) STAB and possible flinch. Ice Fang is for grass types who try to wall. It also gets the Strong Jaw boost. Poison Jab is for the ever present Fairy type. The Tapus are a fan favorite, so getting Poison Jab is good for Sharpedo.
Thinking about adding Crunch or Psychic Fangs for the Strong Jaw boost.
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 Health/ 8 Speed /248 Defense
Nature: Impish
Earthquake | U-Turn | Stone Edge | Stealth Rock
Landorus is pretty amazing. I needed a defensive wall and this does just the thing. It also absorbs electric and ground type hits, so I'd say it does its job well. Earthquake is obvious stab, it also hits Toxapex for decent damage. U-Turn is for pivoting... like it is on every pokemon with it. Stealth Rocks are always nice, especially with the damage from U-Turn on switch ins. Stone Edge is for pretty nice damage and a good critical rate.
Tapu Lele @ Choice Scarf
Ability: Psychic Surge
EVs: 252 SpAtk/ 4SpDef / 252 Speed
Nature: Timid
Moonblast | HiddenPower (Fire) | Psyshock | Shadow Ball
Firstly, I don't have Focus Blast because it literally misses every single time. Moonblast is very obvious. High base power, high special attack, STAB, and good speed. It has it all!1!! Hidden Power Fire is for steel types.... I didn't know what else to put. Psyshock is for anyone who think's they can wall me with Chansey. Psychic Terrain powers this up a lot more, and it has STAB. Shadow Ball hits everything neutrally (except Chansey but nobody likes it anymore so) and even hits through Special Defensive Alolan Marrowak.
Pheromosa @ Life Orb
Ability: Beast Boost
EVs: 52 SpAtk/ 204 Attack/ 252 Speed
Nature: Hasty
Ice Beam | U-Turn | High Jump Kick | Poison Jab
Pheromosa is the face of SM OU. Let's face it, since AEgislash got banned, this thing is next. There arne't really any good counters for it, so might as well use it when we can. Ice Beam is for...coverage? It hits everything pretty hard...all I can say. U-Turn is pretty great. Stab, Life Orb boosted, and a free switch. High Jump Kick is it's main form of damage. The only real setback with having this move is if it misses, Pheromosa is always an OHKO after rocks. Poison Jab is for the Tapus again. It really catches people off guard and I don't know why.
Klefki @ Iron Ball
Ability: Prankster
EVs: 252 Health/ 252 Defense/ 4 Speed
Nature: Bold
Thunder Wave | Toxic | Spikes | Switcharoo
At first I was using Eject Button because I thought that'd be pretty nice with Psychic Terrain forcing hits and switches, and maybe getting a free switch with Porygon's Trace (spoilers oops). But I've found that Iron ball would probably help out more. Thunder Wave is for paralyzes after I've switcharoo'd. Toxic is for ... I don't really know. I guess Iron Ball and Toxic is like toxic and paralyze. Spikes is for entry hazards, like it is on ever single team. It really helps this team, especially by breaking Sashes. Switcharoo is used to switch the Iron ball to a Pokemon (possibly a flying type) basically Paralyzing (and grounding) it.
Porygon2 @ Eviolite
Abilty: Trace
EVs: 252 Health/ 128 SpDef/ 128 Defense
Nature: Calm
Tri Attack | Shadow Ball | Recover | Icy Wind
Tri Attack is main stab. It actually hits surprising hard. Nothing much to say other than decent damage, 10% chance to Burn/Paralyze/Freeze. Shadow Ball is for any Ghost type that would otherwize pretty easyily defeat Porygon. (AKA Gengar with Focus Blast). Recover is for... Recovering. Icy Wind is to slow to be able to Recover damage. It also hits the everpresent Landorus and Lando-T.
Sharpedo @ Sharpedonite
Ability: Speed Boost
EVs: 252 Attack/ 4SpDef / 252 Speed
Nature: Adamant
Waterfall | Poison Jab | Ice Fang | Protect
I gave Sharpedo an Adamant nature because of the Speed Boost ability. This will give it the maximum attack it can have, since it already will be getting a +1 in speed. Waterfall is for the (let's be honest. If scald burn is said to be 30% and it burns every single time the 20% flinch isn't that bad) STAB and possible flinch. Ice Fang is for grass types who try to wall. It also gets the Strong Jaw boost. Poison Jab is for the ever present Fairy type. The Tapus are a fan favorite, so getting Poison Jab is good for Sharpedo.
Thinking about adding Crunch or Psychic Fangs for the Strong Jaw boost.
Landorus-Therian @ Rocky Helmet
Ability: Intimidate
EVs: 252 Health/ 8 Speed /248 Defense
Nature: Impish
Earthquake | U-Turn | Stone Edge | Stealth Rock
Landorus is pretty amazing. I needed a defensive wall and this does just the thing. It also absorbs electric and ground type hits, so I'd say it does its job well. Earthquake is obvious stab, it also hits Toxapex for decent damage. U-Turn is for pivoting... like it is on every pokemon with it. Stealth Rocks are always nice, especially with the damage from U-Turn on switch ins. Stone Edge is for pretty nice damage and a good critical rate.
Tapu Lele @ Choice Scarf
Ability: Psychic Surge
EVs: 252 SpAtk/ 4SpDef / 252 Speed
Nature: Timid
Moonblast | HiddenPower (Fire) | Psyshock | Shadow Ball
Firstly, I don't have Focus Blast because it literally misses every single time. Moonblast is very obvious. High base power, high special attack, STAB, and good speed. It has it all!1!! Hidden Power Fire is for steel types.... I didn't know what else to put. Psyshock is for anyone who think's they can wall me with Chansey. Psychic Terrain powers this up a lot more, and it has STAB. Shadow Ball hits everything neutrally (except Chansey but nobody likes it anymore so) and even hits through Special Defensive Alolan Marrowak.
Pheromosa @ Life Orb
Ability: Beast Boost
EVs: 52 SpAtk/ 204 Attack/ 252 Speed
Nature: Hasty
Ice Beam | U-Turn | High Jump Kick | Poison Jab
Pheromosa is the face of SM OU. Let's face it, since AEgislash got banned, this thing is next. There arne't really any good counters for it, so might as well use it when we can. Ice Beam is for...coverage? It hits everything pretty hard...all I can say. U-Turn is pretty great. Stab, Life Orb boosted, and a free switch. High Jump Kick is it's main form of damage. The only real setback with having this move is if it misses, Pheromosa is always an OHKO after rocks. Poison Jab is for the Tapus again. It really catches people off guard and I don't know why.
Klefki @ Iron Ball
Ability: Prankster
EVs: 252 Health/ 252 Defense/ 4 Speed
Nature: Bold
Thunder Wave | Toxic | Spikes | Switcharoo
At first I was using Eject Button because I thought that'd be pretty nice with Psychic Terrain forcing hits and switches, and maybe getting a free switch with Porygon's Trace (spoilers oops). But I've found that Iron ball would probably help out more. Thunder Wave is for paralyzes after I've switcharoo'd. Toxic is for ... I don't really know. I guess Iron Ball and Toxic is like toxic and paralyze. Spikes is for entry hazards, like it is on ever single team. It really helps this team, especially by breaking Sashes. Switcharoo is used to switch the Iron ball to a Pokemon (possibly a flying type) basically Paralyzing (and grounding) it.
Porygon2 @ Eviolite
Abilty: Trace
EVs: 252 Health/ 128 SpDef/ 128 Defense
Nature: Calm
Tri Attack | Shadow Ball | Recover | Icy Wind
Tri Attack is main stab. It actually hits surprising hard. Nothing much to say other than decent damage, 10% chance to Burn/Paralyze/Freeze. Shadow Ball is for any Ghost type that would otherwize pretty easyily defeat Porygon. (AKA Gengar with Focus Blast). Recover is for... Recovering. Icy Wind is to slow to be able to Recover damage. It also hits the everpresent Landorus and Lando-T.