Very much so, Gyarados, especially with Bite as a fast move is very strong.
I think you mean crunch of outrage. Personally I dont know which one to take over the other as both have their positives and negatives, outrage hits dragons hard, but takes a while to charge, and crunch hits mewtwo, metagross, lugia hard and is spamable, but does nothing to tyranitar
Ive had outrage on mine, and its been pretty great to me vs dragonite/rayquaza, but I haven't done too many battles to know if those were just lower level dragons