Shows the brutality of Explosion, that's for sure. At the end of my HG chapter one, Random the Togepi rolls a Selfdestruct in Union Cave, and the end result isn't pretty. Random and RJ survive, of course, but the cave is annihilated, and lots of Pokémon and a few trainers in the cave die from Rock Slides and the aftereffects of the Selfdestruct. Just shows the raw power Pokémon hold, especially when they don't know how to control it.