The 48-Hour Paid-Gem Costume Scout ×25 A is now live in Pokémon Masters EX, running until November 15. Players can use paid gems to try for new costume sync pairs, with a limit of one pull per account. The short, two-day event offers a focused chance to add exclusive costume variants and strengthen your roster. Trainers aiming to snag these limited-time pairs will want to act quickly before the scout ends.
Source: Official Pokémon Masters EX site