This challenge is the brainchild of Anri Kurokaze, you can find his channels here:
Youtube: http://www.youtube.com/user/AnriKurokaze/videos?view=1&flow=grid
Dailymotion: http://www.dailymotion.com/playlists/user/AnriKurokaze/1

Other Competitors include Star: http://www.youtube.com/playlist?list=PL400DL7Wx-VA2spicjYR8AFCnkWc5eEhW
Newcomer LanturnJoe: http://www.youtube.com/channel/UC11js-ocWYACv6n66noA5zA/playlists
And Star's Challenge Winner MarioYoshi67: http://www.youtube.com/user/MarioYoshi67/playlists

A quick dash through the caves to drop off the letter to Steven, then onward to Slateport, for another delivery!