I'm a new member to smogon, and fairly new to Pokemon competitive play, so I'm not quite sure how these RMTs are supposed to be written. I've been playing Pokemon Online for about a month now, and my rating has peaked at 362, but after testing and changing up my team for a while, my rating has decreased to 1412. I guess that's it for the introduction, so onto the team:
Victini @ Choice Scarf
Trait: Victory Star
EVs: 252 HP/252 Spe/4 Atk
Jolly Nature (-SpAtk +Spe)
-V Create
-Final Gambit
-U Turn
-Wild Charge
I use Victini as my Final Gambit lead, being able to outspeed and KO my opponent's lead before they can set up rocks/spikes. If I see a Chansey during team preview, or my opponent's suspected lead has over 100 base HP, i'll lead with Garchomp or Mew instead.
Mew @ Leftovers
Trait: Synchronize
EVs: 252 HP/220 Def/36 Spe
Impish Nature (-SpAtk +Def)
-Will o Wisp
-Stealth Rock
-U Turn
-Roost
I needed a Pokemon with respectable physical bulk who could set up stealth rocks, making Mew the perfect candidate. With the current spread, Mew finds himself with 404 HP and 320 Def, capable of taking almost any physical attack and then pulling off a Will o Wisp to neutralize the attacker, letting mew set up Rocks or just Roost stall them to death. U Turn helps Mew deal with Reuniclus switch-ins or just allow for a free switch against a speedy enemy. Mew is also able to take a swords dance boosted attack from Garchomp or Excadrill (except X-Scissor) and then use Will o Wisp to prevent them from sweeping.
Garchomp @ Choice Scarf
Trait: Sand Veil
EVs: 252 Atk/252 Spe/4 Def
Jolly Nature (-SpAtk +Spe)
-Outrage
-Earthquake
-Fire Blast
-Stone Edge
Garchomp is my revenge killer, reaching a blistering speed of 500, enough to outspeed practically every threat in OU, including all base 100 pkmn at +1. He also is capable of sweeping late game, if my opponent's pkmn that resist his stabs have been KO'd.
Scizor @ Choice Band
Trait: Technician
EVs: 248 HP/252 Atk/8 Spe
Adamant Nature (-SpAtk +Atk)
-Bullet Punch
-U Turn
-Pursuit
-Superpower
Scizor makes a great clean-up Pokemon. With a Choice Band, he can KO practically any pkmn below 50 HP that doesnt resist his Bullet Punch. He is also a good counter to Reuniclus, with U Turn putting Reun in KO range of any of my other pkmn. Pursuit is useful for trapping Gengar, Specs Latios, Jellicent, and any other pkmn that would switch-out at the sight of this metal bug. Superpower is there for Blissey and Chansey, who normally wall most of my team.
Suicune @ Leftovers
Trait: Pressure
EVs: 252 HP/252 Def/4 SpAtk
Bolt Nature (-Atk +Def)
-Calm Mind
-Rest
-Sleep Talk
-Scald
Suicune serves as a great mixed wall. Being as there are almost no physical electric or grass pokemon, Suicune can easily burn a physical attacker with Scald, and then set up a couple Calm Minds in it's face. It can take a hit from the opposite spectrum as well with its base 100 HP and Calm Mind boosted base 115 SpDef. Rest and Sleep Talk are there to remove status from Chansey and other pesky pkmn that try to put Cune on a clock with Toxic.
Chansey @ Eviolite
Trait: Natural Cure
EVs: 252 HP/252 Def/4 SpDef
Bold Nature (-Atk +Def)
-Wish
-Protect
-Toxic
-Seismic Toss
Chansey is the biggest troll in the game. I have won so many games by simply burning or Victiciding their physical attackers, and having Chansey toxic/seismic stall their entire team. With a bold nature and 252 Def EVs, Chansey is capable of taking a few physical hits as well, allowing her to poison, and then wish/protect stall physical attackers to death.

Victini @ Choice Scarf
Trait: Victory Star
EVs: 252 HP/252 Spe/4 Atk
Jolly Nature (-SpAtk +Spe)
-V Create
-Final Gambit
-U Turn
-Wild Charge
I use Victini as my Final Gambit lead, being able to outspeed and KO my opponent's lead before they can set up rocks/spikes. If I see a Chansey during team preview, or my opponent's suspected lead has over 100 base HP, i'll lead with Garchomp or Mew instead.

Mew @ Leftovers
Trait: Synchronize
EVs: 252 HP/220 Def/36 Spe
Impish Nature (-SpAtk +Def)
-Will o Wisp
-Stealth Rock
-U Turn
-Roost
I needed a Pokemon with respectable physical bulk who could set up stealth rocks, making Mew the perfect candidate. With the current spread, Mew finds himself with 404 HP and 320 Def, capable of taking almost any physical attack and then pulling off a Will o Wisp to neutralize the attacker, letting mew set up Rocks or just Roost stall them to death. U Turn helps Mew deal with Reuniclus switch-ins or just allow for a free switch against a speedy enemy. Mew is also able to take a swords dance boosted attack from Garchomp or Excadrill (except X-Scissor) and then use Will o Wisp to prevent them from sweeping.

Garchomp @ Choice Scarf
Trait: Sand Veil
EVs: 252 Atk/252 Spe/4 Def
Jolly Nature (-SpAtk +Spe)
-Outrage
-Earthquake
-Fire Blast
-Stone Edge
Garchomp is my revenge killer, reaching a blistering speed of 500, enough to outspeed practically every threat in OU, including all base 100 pkmn at +1. He also is capable of sweeping late game, if my opponent's pkmn that resist his stabs have been KO'd.

Scizor @ Choice Band
Trait: Technician
EVs: 248 HP/252 Atk/8 Spe
Adamant Nature (-SpAtk +Atk)
-Bullet Punch
-U Turn
-Pursuit
-Superpower
Scizor makes a great clean-up Pokemon. With a Choice Band, he can KO practically any pkmn below 50 HP that doesnt resist his Bullet Punch. He is also a good counter to Reuniclus, with U Turn putting Reun in KO range of any of my other pkmn. Pursuit is useful for trapping Gengar, Specs Latios, Jellicent, and any other pkmn that would switch-out at the sight of this metal bug. Superpower is there for Blissey and Chansey, who normally wall most of my team.

Suicune @ Leftovers
Trait: Pressure
EVs: 252 HP/252 Def/4 SpAtk
Bolt Nature (-Atk +Def)
-Calm Mind
-Rest
-Sleep Talk
-Scald
Suicune serves as a great mixed wall. Being as there are almost no physical electric or grass pokemon, Suicune can easily burn a physical attacker with Scald, and then set up a couple Calm Minds in it's face. It can take a hit from the opposite spectrum as well with its base 100 HP and Calm Mind boosted base 115 SpDef. Rest and Sleep Talk are there to remove status from Chansey and other pesky pkmn that try to put Cune on a clock with Toxic.

Chansey @ Eviolite
Trait: Natural Cure
EVs: 252 HP/252 Def/4 SpDef
Bold Nature (-Atk +Def)
-Wish
-Protect
-Toxic
-Seismic Toss
Chansey is the biggest troll in the game. I have won so many games by simply burning or Victiciding their physical attackers, and having Chansey toxic/seismic stall their entire team. With a bold nature and 252 Def EVs, Chansey is capable of taking a few physical hits as well, allowing her to poison, and then wish/protect stall physical attackers to death.