The only information I have is that there are 5 kids. 2 of them are named Dylan and Mike. 4 of the five kids have defeated their parasites, Dylan hasn't. Dylan has the power to see fractures, or weak points. Mike can grow plants really really fast. And there may be something about a being that sleeps in a mountain or something. That's all I know. If anyone can sell me anything about what book this is, I'd really appreciate it. It may have the word "Soul" in the title.
This might be Scorpion Shards, the first book in Neal Shusterman's Star Shards Chronicles. The main characters are six teens with superpowers, but in the first book, those abilities have been corrupted by "otherworldly parasites."
One character, Dillon, "has the terrifying power to create massive amounts of destruction with the slightest tweak of his will." He's an antagonistic character to begin with—so the "good guys" consist of five teens, at first—but when he manages to overcome his parasite, he becomes the sixth team member.
Another character is named Michael, but as far as I can tell he doesn't have plant-growing abilities. TVTropes says "he can control the weather with his emotions" and Publishers Weekly says Michael, "overcome with lust, provokes killing fury in jealous men" (but I think this is his parasite's evil version of a kinder, gentler superpower).
I can't recall or find any evidence that the first book features a being that sleeps in a mountain; however, the second book apparently deals with "an ancient, malevolent, soul-eating foe who has escaped from his long imprisonment."