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[[File:Masters Arc Suit Steven Lance Cynthia artwork.png|thumb|250px|Artwork of {{mas|Steven}}, {{mas|Lance}}, and {{mas|Cynthia}} wearing their arc suits]]
An '''arc suit''' (Japanese: '''アルコス''' ''Arceus Costume'') is a special type of outfit appearing in [[Pokémon Masters EX]] that is designed to resemble {{p|Arceus}}. They are granted, through the power of [[sync stone ultimate|sync stones ultimate]], to {{pkmn|Trainers}} who have a very strong bond with their partner Pokémon. The outfits are said to have been blessed by Arceus. Once a Trainer has awakened their arc suit, they can freely activate it again at will. However, it is a temporary transformation; it reverts to the Trainer's original clothes after a certain amount of time.

Unlike [[sygna suit]]s, which denote a [[sync pair]] formed with a different partner Pokémon than normal, arc suit sync pairs are new sync pairs formed with the same partner Pokémon. These sync pairs can be scouted to join the {{player}}'s team through special [[sync pair scout]]s called Arc Suit Fairs.