DeNA has announced that the Legendary Arena Tapu Bulu will be available from June 28th, 2023 at 11:00 p.m. until July 12th, 2023 at 10:59 p.m.

Legendary Arena Tapu Bulu

Added new event missions to Legendary Arena Tapu Bulu! Added new event missions to Legendary Arena Tapu Bulu for a limited time! You can complete higher difficulty missions to get Gems!

Date/Time

June 28, 2023 at 11:00 p.m. - July 12, 2023 at 10:59 p.m.

Legendary Arena

The Legendary Arena is a special battle area where you can form multiple teams and take on the challenge using a set number of sync pairs. You can complete the related missions to earn Medals that can only be obtained here!

Important

• To attempt Legendary Arena missions, you must have completed Main Story Chapter 2: Defeat Team Break! (Normal) in single-player.
• The added limited-time event missions do not count toward the completion requirements for Legendary Arena Mission Completion Rewards.
• All mission completion rewards for the added limited-time event missions must be claimed within three days of the mission period ending.
• The time period and featured content are subject to change without notice.

Source: https://pokemonmasters-game.com/en-US/announcements/Event_5050_5W_2