Element Spirit (Ability)

Water Spirit is an Ability introduced in Generation VII. Only one Pokemon can have this Ability.

In battle
Water Spirit adds the Water-Type to the user's current Type(s) while in battle. The user will then gain STAB on any Water-Type moves, and will be subject to Type match-ups relating to the Water-Type. If this Ability is negated, the STAB and Type match-ups no longer apply.

Trivia

 * Water Spirit is the only Ability that can cause a Pokemon to have three Types during battle.