Rocket

A rocket (ロケット) is a vehicle used to obtain thrust from a rocket engine by pushing the rocket forwards simply by throwing their exhaust backwards extremely fast. When Mega Man Volnutt was stuck in Elysium in the end of Mega Man Legends 2, Roll Caskett and Tron Bonne teamed up to create a rocket to rescue him, but their initial attempts didn't work. Barrell Caskett mentions that the rocket in the ending was the tenth rocket they built, and it exploded while flying.

Mega Man Legends 3
In Mega Man Legends 3, the the 28th rocket was under development. The game's official site had a "Rocket Development Progress" section that represented the game's completion, being upgraded five times between November 16, 2010-April 19, 2011 before the game's cancellation in July 18, 2011.