Also mention how Double Edge offers beautiful neutral coverage on the offensive DD set and it kills many common switch-ins to gyarados at +1 such as Rotom-W, Kyurem-B, and Dragons. Its obvious downfall is the recoil, which when added with LO, kills Gyarados pretty fast. Also add Return in the AC of the same set, which OHKOes most of the Pokemon that Stone Edge does, except for Kyurem-B and opposing Gyarados, but has better accuracy.
And now you are free to write this!!!