Defensively, the Water type is very strong when combined with high defensive stats. Most Water types can use Ice-type moves to counter Grass types. As such, Electric types are the only true threat to Water types, as few Pokémon of the Water type can learn strong Ground-type moves. However, Water types that have Grass, Ground, or Dragon as their other type have the advantage of having their Electric weakness nullified. Although these type combinations are neutral to Ice, it is possible to deal 4× times damage with Freeze-Dry, an Ice-type move introduced in Generation VI that ignores the Water type's resistance to Ice.
The Water type is also useful offensively, especially as powerful Water-type moves are plentiful. Almost all Water-type Pokémon can learn strong Ice-type moves to deal with Dragon and Grass types, which would make their resistance to Water-type attacks irrelevant. Water also has good coverage in conjunction with Dragon and Flying-type moves. It can be extremely useful to be super-effective against Fire, Ground, and Rock types. Also, double weaknesses to Water are fairly common, while there are only a few Pokémon that have a double resistance to Water.
During rain or heavy rain, the power of Water-type moves is increased by 50%. The power of Water-type moves is decreased by 50% during harsh sunlight, while the Water-type moves themselves will fail during extremely harsh sunlight.
In Contests, Water-type moves are typically Beautiful moves, but they can be from any other Contest type.
As of Generation VII, there are 133 Water-type Pokémon or 16.5% of all Pokémon (counting those that are Water-type in at least one of their forms), making it the most common of the eighteen types. All other types have been paired up with Water at least once - after the official release of Volcanion, Water became the second type to have this trait, after Flying.
Due to the decreased amount of types in the TCG, Water generally adopts all Ice-type Pokémon under its typing.
Similar to the games, Water-type Pokémon in the TCG are generally weak to Grass and Lightning with no resistances. Water-type Pokémon are strong against Fighting and Fire Pokémon, whilst Grass and Colorless Pokémon can resist this type.
Generation I introduced the most Water-type Pokémon of any generation, with 32, and Generation VI introduced the fewest Water-type Pokémon, with nine.
Generation I introduced the most Water-type moves of any generation, with nine, and Generation VI and Generation II introduced the fewest Water-type moves, with three.
The Water type has the most Pokémon that evolve via trading, with a total of six including: Politoed, Slowking, Kingdra, Milotic, Huntail, and Gorebyss.