The fifth season of Pokémon Sword and Pokémon Shield Ranked Battles has begun and will run throughout April 2020. Test your Trainer skills in head-to-head battles with players around the world, move up the leaderboards, and earn in-game rewards.
You’ll be matched up with other players of similar rank to ensure even competition. When the season concludes, the higher the tier you finish in, the greater your in-game rewards. To start a Ranked Battle, select VS in the X menu, select Battle Stadium, and then select Ranked Battles. You can press the Y Button to see an overview of Ranked Battles before you begin your match.
Source: Pokemon.com
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