From Wikifang, a definitive guide to Telefang, Dino Device and Bugsite
True Denjuu (Bootleg: TruMon) is an evolutionary stage for Denjuu in Telefang 1. All True Denjuu are fourth-stage (with the exception of Bashou, who is first-stage) and cannot evolve. They are evolved naturally from Super Denjuu.
There are five True Denjuu. They are the 11th stage found in the game's encyclopedia, and are numbered 156 to 160.