Sun Offense + Anti Weather, Anti TR
Roster
AbilitySolar Power
NatureModest
EVs2 HP / 32 SpA / 32 Spe
Moves
ProtectHeat WaveSolar BeamWeather Ball
AbilityRough Skin
NatureAdamant
EVs12 HP / 32 Atk / 4 SpD / 18 Spe
Moves
ProtectEarthquakeRock SlideDragon Claw
AbilityPrankster
NatureBold
EVs32 HP / 2 SpA / 32 SpD
Moves
TailwindMoonblastEncoreSunny Day
AbilityPixilate
NatureModest
EVs32 HP / 2 Def / 32 SpA
Moves
Hyper VoiceProtectPsychicMystical Fire
AbilityChlorophyll
NatureModest
EVs2 HP / 32 SpA / 32 Spe
Moves
ProtectEarth PowerSludge BombSolar Beam
AbilityStance Change
NatureAdamant
EVs17 HP / 32 Atk / 9 Def / 8 SpD
Moves
King's ShieldIron HeadSacred SwordWide Guard
Strategy
If there is only 1 form of weather or tailwind as speed control no Mega Raichu X or Y, use Mega Zard Y, Venasuar, Whimiscott and either of the remaining pokemon. Else, use whimiscott, mega garchomp, aegislash and svyleon
Lead Options
Whimiscott + Zard/ Svyleon + Whimiscott
Win Conditions
Sweep after weather or speed control/ Outlast opponents and chip away
Threats & Bad Matchups
Threats -> Dual Weather Archtypes, Mega Raichu for sun / For Anti Weather/ Anti TR -> High DPS one hit KO mons