This is a toolassisted speedrun. For more information, see http://tasvideos.org/3250M.html. TAS originally published on 20161104.
Mega Man X2 makes a particularly interesting run as there are many weapons that can be used to increase mobility. These include a grappling hook, a fast midair dash, and a weapon that can transform enemies into platforms.
This TAS obsoletes the "low%, best ending" (http://tasvideos.org/1392M.html) as well as the "all upgrades" (http://tasvideos.org/3096M.html) runs, since it collects all the parts of both X and Zero. It became possible to separate the "full completion" branch from the "any%" one after it was found to be faster to forgo acquiring the Shoryuken in the latter.