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I often train up Pokemon without checking for build advice, and occasionally come up with something decent.
In X/Y I had an Altaria named Hoverpuff with cotton guard, roost, dragon breath, and flamethrower. When I went up against the resident tourney-level player among my group of friends, he admitted that Hoverpuff's moveset caught him off-guard in a way that bought me a short advantage instead of just causing him to shrug and still kick my ass.