How to Catch Umbreon in Pokémon Scarlet

Actually, catching Umbreon? You can't exactly 'catch' one per se. You evolve Eevee with lots of love and a bit of nighttime magic. That's your real catch.

To catch an Umbreon in Pokémon Scarlet, you'll need to start with an Eevee. Eevee evolves into Umbreon, but the trick is it has to happen during the night in the game, and Eevee needs to have a high happiness level. You can increase Eevee's happiness by battling together, using items on it, and keeping it in your party. Once Eevee is super happy, just level it up at night, and voilà, you've got yourself an Umbreon!