It really depended on how I felt at the time and if it was in a challenge or not. If I was feeling unsure about the Rocket hideout, I'd use it to storm the hideout. In my Solo Challenge with Luna(Gardevoir), I made it my whirlpool slave since I already made my other Gyarados a HM Slave(Surf, Waterfall, Strength, Rock Smash). In my flying monotype, it became one of my main fighters. If I felt like being silly, I'd just use it as a double battle partner. Usually, I'd box it to never see the dark of night.