Frustration. Same power as Return, but with a catch. Your pokemon actually have to HATE you in order to get that max damage. But here's the thing: You know how your friendship rises?
Walking. It is nearly impossible to keep that perfect frustration. Besides, who wants to be known as the trainer that makes his/her pokemon hate them?
Fell stinger isn't useless. It is, admittedly, a worse pup, but at least it isn't useless early game. (Soz for quoting after, but lag is dumb and I'm on an ipad, so yea)