Weather~is a formidable force to be reckoned with in VGC doubles. Let's take a look.
RAINRain is the most common occurrence for a weather team. In Rainy weather water moves do twice the amount of damage while Fire damages is halved. This weather really helps Water types unleash havoc with STAB Surf and other moves.
Some Common Leads:
~Politoad+Kingdra: Kingdra's Swift Swim boosts its speed in rain while Politoad's Drizzle sets up the weather. Politoad spams Surf and Kingdra uses Draco Meteor on threats.
~Politoad+Ludicolo: Ludicolo is a great to have for its regen. abilities in rain plus taking care of pesty Water types.
Other Options: Gastrodon(heals on Surf), Toxicroak, Kabutops
SandstormSandstorm teams benefit greatly from getting extra damage to their opponents through weather damage.
Some Common Leads:
Tyranitar: He is a must for his abilty to kick up a sandstorm quickly. Has a very powerful STAB Earthquake.
Hippowdon: Tanky Pokémon who can dish out large amounts of damage while taking it himself.
Garchomp: Haxy Sand-Veil makes him dodge 25% of attacks while providing Dragon support.
HailTo be continued
Sorry about not completing this in one go
Had some things to take care of and I hope to finish this up as soon as I can. Thanks for reading!
SunTo Be Continued