This is a TAS (tool-assisted speedrun). Visit http://tasvideos.org for more information about TAS in general, or http://tasvideos.org/5841S.html for more information about this run!
Frame count: 405399
Rerecords: 38117
Uncommentated version: https://www.youtube.com/watch?v=7LeP5K4hKQQ
Thanks to Muzyoshi for drawing the thumbnail art!