DeNA has announced that the Legendary Arena Entei and 5★-Select Special Scout ×11 will take place from October 3rd, 2021 at 11:00 p.m. until October 17th, 2021 at 10:59 p.m. in Pokémon Masters EX.

Legendary Arena Entei

Legendary Arena: Entei is back! Starting today, Legendary Arena: Entei returns! New Event Missions have been added along with its return! You can complete higher difficulty missions to get Gems!

Date/Time

October 3, 2021 at 11:00 p.m. - October 17, 2021 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.
• Your area info and mission completion data will be saved at the event’s conclusion and will be used the next time this event returns.
• While Legendary Arena missions will also be displayed on the General missions screen, they cannot be attempted outside of the challenge period.
• Event missions held at the same time as the Legendary Arena do not count toward the completion requirements for Legendary Arena Mission Completion Rewards.
• All completion rewards for event missions held at the same time as the Legendary Arena 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_3090_2W_1

5★-Select Special Scout ×11

Scout 11 Sync Pairs PLUS a 5★ sync pair of your choice in the 5★-Select Special Scout ×11. A one-time only 5★-Select Special Scout ×11 will be available during the time period below. This special sync pair scout allows you to select a 5★ sync pair after scouting the initial 11.

Date/Time

October 3, 2021 at 11:00 p.m. - October 17, 2021 at 10:59 p.m.

Important

• This sync pair scout can only be utilized once during the scout period.
• The special 5★ sync pair can only be claimed for a limited time. It cannot be claimed after the scout period ends.
• Please note that you cannot have two or more sync pairs that include Trainers with the same name in your team.
• The pool of 5★ sync pairs available for selection in this sync pair scout is limited.
• To check the available sync pairs in this sync pair scout and their respective offering rates, go to the Offering Rate section on the Sync Pair Scout screen.
• Please read the Notes section under Offering Rate on the Sync Pair Scout screen before using the feature.
• This sync pair scout is available using paid gems only.
• The time period and featured content are subject to change without notice.

Source: https://pokemonmasters-game.com/en-US/announcements/BSearch_3090_2W_1