User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-3095304-20130212182040/@comment-5029315-20130212184109

I don't think you can increase the frequency of it, but I do know that the bombardier skill increases the explosion damage (not element attack up). But the Brachy and Ura (i think ura has it) armor is the only one I know of that has that skill naturally.