Ability
Swift Swim
If Rain is active, this Pokemon's Speed is doubled.
Weather Rain Dance
Lasts 5 turns (8 with Damp Rock). Water-type moves deal 1.5× damage and Fire-type moves deal half. Thunder and Hurricane never miss and Solar Beam loses half its power. Activates Abilities such as Swift Swim.
Pokémon with Swift Swim (6)
"hidden" means it is that form's hidden ability. Megas have a fixed ability.
Data: Pokémon Showdown (smogon/pokemon-showdown) · commit d601443 · Data & methodology