Successfully complete the game. Start another game session. Play the desert stages (after Crosswinds or the cross-over stage). One of them features a cinematic with Konig Monster Destroid and Zentradi enemies cheering a singing Loli-Chan idol. Afterwards, you must fight two Bosses with the Idoru occasionally appearing on your main screen. During those two Boss battles, try to bump into or shoot the allied Konig Monster that is in flying shuttle form. It will appear as a blue dot on the mini-map. Note: If you have two wingmen, the Monster shuttle is one of the three blue dots on the mini-map. Complete that mission to unlock the mech and its pilot.