Fiend Listing - Monster Arena
The Imp both an enemy and a type of enemy (Imp-type). It can be found inside the Cavern of the Stolen Fayth. You need to capture five of each Imp-type enemy in order to unlock Vidatu in the Species Conquest section of the Monster Arena.
Imps are flying creatures so have Wakka use his Blitzball attack to take them out. They are not resistant to any magic types so have Lulu cast any spells on it that you like as an alternative to using Wakka.
|Sensor||“Aerial. Resistant to magic.”|
|Scan||“Aerial and hard to hit. It’s weak against water, but has high magic defense. The only attack it has is Thundaga, so inflict silence to leave it powerless.”|
They can be found anywhere inside the Cavern of the Stolen Fayth.