Psycorogue is a sole Mirror Monster that was contracted by The Alternatives.
Psycorogue is a Mirror Monster that resembles a humanoid cricket. This contract monster has white armor with black accents while Alternative's armor was black and Alternative Zero's was black with white accents, contrary to other Riders whose armor were similar with their contract monster.
Psycorogue survived it's masters when controlled by Yui. It was weakened by Ryuki's Drag Claw Fire and then destroyed by Knight's Hishou Zan.
Kamen Rider Decade: All Riders vs. Dai-Shocker
Psycorogue is part of Dai-Shocker army and defeated by Kamen Rider RX.
Psycorogue could transform into a motorcycle called the Psycoroader. The Final Vent move Dead End transforms Psycorogue into a motorcycle then an Alternative and motorcycle spin-out faster and faster until they ram into the opponent.