Water

Rain makes its attacks 50% stronger and Fire attacks 50% weaker, and abilities such as Swift Swim double the holder's Speed for as long as it keeps raining.

Its attacks are super effective against Fire, Ground and Rock, and not very effective against Water, Grass and Dragon. On defence it takes double damage from Electric and Grass, and resists four types: Fire, Water, Ice and Steel. There are 154 Water-type species, 74 of them pure Water; the most common pairings are Water/Rock (11) and Water/Ground (9). It has 49 moves: 18 physical, 25 special and 6 status.