Rush

Rush is Mega Man's faithful robotic dog, created by Dr. Light to assist Mega Man in his travels. He debuted in Mega Man 3. Initially, Rush was able to transform into a coil, a hoverboard, and a submarine. Since then, Rush appeared in most games related to the original Mega Man series. He appears only in Super Smash Flash 2 with two minor appearances, although both of them got removed later on.

In the Super Smash Flash series
Rush appeared in Super Smash Flash 2 as a part of 's Final Smash, the Super Adapter from demos v0.5a up until v0.9b, and on Mega Man's revival platform until v0.8b.

Trivia

 * Rush appears in Super Smash Bros. for Nintendo 3DS and Wii U as a part of a recovery move for Mega Man.