The character known only as the “Scammer Pansage” is a female Pansage who is at times mentioned in plotlines related to Volyrina's character. She is a recurrent outlaw in the main PMD world by the time of the events of Gates to Infinity.
What little is known of the “Scammer” is that she at some point in time a few years before Gates at most, scammed Volyrina out of her savings for the first deed offering that Quagsire published. The Pansage is suspected to have scammed some other Pokémon around the Mis Continent, but she has not been found.
By the time of the events of Gates…, Volyrina is using Team Idílljrot and its resources partly to track down the scammer and get some retribution. For this end, Volyrina is using Centella's help and learning how to construct a case and spread the information needed to track down and arrest such a mon. ( Where We Live And Work ).
End spoilers.