>The Primordial Sea Ability, which only Primal Kyogre has, changes the weather condition to an oppressive heavy rain. It is not possible to change the weather condition during heavy rain (leaving aside the efforts of an exceedingly small number of Pokémon).
>Features of the heavy rain condition:
・Grants the same effects to Pokémon and their moves as the rain brought about by the Drizzle Ability
・The moves Rain Dance, Sunny Day, Sandstorm, and Hail will fail
・The Abilities Drizzle, Drought, Sand Stream, and Snow Warning will fail to activate
・Fire-type attacks will become ineffective
>Normally, the Abilities Drizzle, Drought, Sand Stream, and Snow Warning all last for five turns after being activated, regardless of whether the Pokémon is still in battle or not, and then the weather returns to normal.
>Primordial Sea’s weather effects, however, will last as long as Primal Kyogre remains in battle. As soon as it is swapped out for another Pokémon, the weather immediately returns to normal.
Huh. This is less OP than I thought.
