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Answer from: NiceGuy1
Many of the Skystones you just get by re-challenging people, and who you get it from depends on who you re-challenge, but from what I hear, Boom Fiend is exclusive to one player, named Smoltergeist.
Go to Chapter 5: Glacier Gully. After you meet Noodles a few times, eventually you'll seem to be at a dead end, but really you progress down a giant chain to the left. DON'T. Instead, go first down the chain to the right, where funnily enough you'll immediately meet Smoltergeist before you even open the Fire Gate here, but he doesn't play here. Open and enter the Fire Gate.
After you drop down off the forward edge twice, some orange gems will be in your way to do it again. Once you clear them, there are two spots you can drop off the forward edge (in addition to one or two on the right side). Of the forward ones, the left one leads to a small area with Smoltergeist who is waiting to play Skystones with you. The first time you beat him, he awards you with Boom Fiend, who is a Fire stone.