Time travel

The Time Skimmer is the time machine that Dr. Wily used to travel to the future during the events of Mega Man II. The device is mentioned only in the USA and European manual of the game.

Before the events of Mega Man II, Doctor Wily learns of a top-secret government project to create an experimental time-machine known as the Time Skimmer at the Chronos Institute. He proceeds to steal it, and uses it to travel approximately 37.426 years in the future. While in the future, he experiments with the technology of the age and reprograms the future version of Mega Man, taking him back to his own time and renaming him Quint.

It's believed the Time Skimmer (or a similar machine) was used by the antagonist from Rockman and Forte: Mirai Kara no Chousensha, Rockman Shadow. Shadow is apparently also a modified Mega Man from the same future as Quint, although it is not explained how there are two Mega Men in this future.