Synchronoise is Gardevoir or Gallade’s exclusive move for August’s Pokémon Go Community Day

If I’m not mistaken, in the mainline Pokémon games Ralts cannot normally learn this move as well.

☆ NintendObs Weekly – Monday, July 29, 2019 – Sunday, August 4, 2019.

Directly to you from Twitter:

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Click on Community to learn more. 🙂

…

…Wanna play? Buy a 3DS.

That being said, click on Pokémon Go for everything you need to know about the game. 😀