User blog comment:PitchBlack696/Zinogre/@comment-87.217.45.240-20101127085349

According to a Famitsu interview this guy can charge itself up by collecting Thunderbugs. Then he turns faster and stronger.

http://www.gamefaqs.com/boards/991479-monster-hunter-portable-3rd/57286192?page=2

Makes sense with what was shown in the opening movie.