In Evil Evolution, the four Mechtogan permanently fused into Mechtavius Destroyer and banished the Brawlers to the Doom Dimension after defeating them in battle.
In Evil vs. Evil, he fought Gunz and the Nonets. Overwhelming the Nonets without difficulty, he managed to kill and absorb most of them with the exception of Betadron and Worton. Mechtavius Destroyer grew massively in size as a result of his destruction.
In End of the Line, he fought Dragonoid Destroyer one-on-one, but was obliterated by him. Because he was destroyed before he can complete his plans, the future Mechtavius Destroyer was erased from the future.
Diabolical Energy Cannon
Mechtavius Destroyer was exclusive to Target. All four Mechtogan included in the set are Darkus. Coredegon has 260 Gs, Exostriker has 230 Gs, Mandibor has 250 Gs, and Slycerak has 240 Gs.
There are two different boxes for the Mechtavius Destroyer set. Some have the Mechtogan listed on the side with Slycerak before Exostriker, and some have this order reversed.