PokéBase - Pokémon Q&A
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Primordial Sea boosts water type moves while Desolate Land boosts fire type moves. They also have other effects. For more details, check their respective pages on the Database.

Source: Pokémon Database

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Just in case you're reading this and don't trust Pokemon DB, Bulbapedia also says this answer is right. https://bulbapedia.bulbagarden.net/wiki/Weather