In the 49th episode of Sonic X, after Decoe and Bocoe turn good and become servants of Chris, why did they become evil after?

They weren't really permanently good. Plus, they're mainly used for comic relief anyways, so it's not as if much depended on their existence, kind of like Chris (although Chris is a bit more like a main character). Although things did take a serious turn when they (seemingly) betray Doctor Eggman, they eventually just ran back to him because they knew they couldn't really turn on their creator.  Timelinesplitter  13:38, January 18, 2013 (UTC)