We have addressed the following issue.
Note: Changes will be reflected after updating to Ver. 2.14.0 or higher.
Note: The exact time the update becomes available may differ for each player.
Note: Please try again later if the update is not available.
In co-op battles, if multiple Master Sync Pairs were included in the same Team, the effects of their Master Passive Skills may have been calculated at higher values than in single-player battles.
May 30, 2021 at 11:00 p.m. – October 26, 2021 at 10:59 p.m.
This has been fixed so that effects are calculated correctly.
We sincerely regret any inconvenience caused.
We hope you continue to enjoy Pokémon Masters EX.
Source: Official Pokémon Masters EX site