Within the VS option in the game, there's the Ranked Battle option. This system allows for players to enter a special series of battles against players around the world in order to earn points to reach different tiers and get different rewards. Each series has got a different ruleset and the rulesets can be downloaded in the Download Rules.
List of Ranked Battle Series
|Series 2||January 3rd 2020 04:00 UTC - January 31st 2020 23:59 UTC|
|Series 1||November 15th 2019 - December 31st 2019|