Truth Pesce is a Shadow in the Persona series.
The Truth Pesce is encountered in B7F and B8F of the Secret Laboratory within the Midnight Channel. After being defeated, they may drop the Guard Stationary material. Selling 10 Guard Stationary will unlock the Mail Duster claws for Teddie in the shop.
In Golden, it only appears in B6F. It may also drop Meteorite for trade at Shiroku Pub.