There are 3 main issues with this team:
- The Rain matchup is almost unwinnable. Barraskewda can spam Flip Turn and OHKO or 2HKO all members of your team.
- The Dragapult matchup is very tough. Specs Dragapult can freely spam Shadow Ball and OHKO or 2HKO all team members.
- The Koko matchup is rough. It can spam it STABs and do huge damage every time.
My Changes:
Urshifu-Rapid-Strike -> Mew
Mew @ Colbur Berry
Ability: Synchronize
EVs: 252 HP / 4 Atk / 252 Spe
Jolly Nature
IVs: 0 Atk
- Stealth Rock
- Spikes
- Taunt
- Thunder Wave
This mew can set up Rocks and Spikes to support your team's sweepers. Taunt stops Defog and deters setup. The fourth slot is rather variable, but I prefer TWave for this team. TWave can ruin Tornadus, Specs Dragapult and Colbur Berry let's you take knock off and ruin Weavile with TWave.
Gengar -> Dragon Dance Dragapult
Dragapult @ Life Orb
Ability: Clear Body
EVs: 252 Atk / 4 SpA / 252 Spe
Lonely Nature
- Dragon Dance
- Dragon Darts
- Phantom Force
- Fire Blast
Dragon Dance and STABs are self explanatory. Fire Blast let's you severely dent Buzzwole and Bulky steel types like Ferrothorn and Corviknight. DD Dragapult helps out greatly against opposing rain teams. It can clean up easily after Barraskewda is paralyzed and Ferrothorn has taken some chip. It is also fairly potent against opposing Screens and Aurora Veil teams, as well as frail offensive teams in general.
Victini -> Shuca Berry Melmetal
Melmetal @ Shuca Berry
Ability: Iron Fist
EVs: 252 Atk / 244 SpD / 12 Spe
Adamant Nature
- Double Iron Bash
- Earthquake
- Ice Punch
- Thunder Punch
Shuca Melmetal is a good check to opposing SD Garchomp, which can easily sweep otherwise. Earthquake destroys hits Toxapex and Heatran and can surprise Roost using Corviknight and Zapdos. Ice Punch is for Garchomp and Landorus-Therian. Thunder Punch covers Slowbro and pelipper. 12 speed evs allow to outspeed uninvested Toxapex. Adamant Max Attack helps you to not sink momentum. The rest is in Sp.Def to help take Dragapult Shadow Ball and Tapu Lele's STABs. The spread is fairly customizable, feel free to experiment with it.
Changed sets:
Garchomp @ Yache Berry
Ability: Rough Skin
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Earthquake
- Fire Fang
- Scale Shot
This is the standard SD Garchomp set. Scale Shot boosts speed, EQ is self explanatory and Fire Fang hits Corviknight and Buzzwole. Yache berry allows you to 1v1 Buzzwole and survive Choice Band Weavile Ice Shard.
Thundurus @ Life Orb
Ability: Prankster
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Taunt
- Thunder Wave
- Thunderbolt
- Grass Knot
Taunt allows you to block Defog attempts and keep Mew's hazards. It also blocks Status from Landorus-Therian and stops Defensive pokemon from healing. Thunder Wave makes sure no weather sweeper, scarfer or setup sweeper can counter sweep this team. Tbolt is STAB. Grass Knot chunks ground types like Landorus-Therian and Garchomp. This makes it easier for Kartana to sweep lategame.
Kartana @ Protective Pads
Ability: Beast Boost
EVs: 4 HP / 252 SpD / 252 Spe
Timid Nature
IVs: 19 Atk
- Swords Dance
- Leaf Blade
- Knock Off
- Sacred Sword
Timid Nature and the attacks IVs make it so that you always boost speed after getting a KO. This is great on hyper offense builds such as yours. Max Special defense investment let's you take Hurricane from Tornadus and Zapdos from full, and make it very unlikely for Tapu Koko to 2hko you. Protective Pads stops Static Zapdos and Rocky Helmet chip from cutting your sweep short.
Final Team: https://pokepast.es/113312da6b4fcfeb