The answer: No.
Earlier today I played a Pokemon X/Y Free Battle match against JUKAI (male), from Kyoto, Japan, who used a suspicious Ambipom that outspeed my Mega Mewtwo Y and Choice Scarfed Garchomp. Let's take a look at a few facts before I jump to any conclusions:
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None of Ambipom's Abilities boosts its Speed rating.
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My opponent's Ambipom didn't hold a Choice Scarf because it used two different moves in a row (Fake Out and Last Resort).
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The highest possible Speed that Ambipom can reach at level 50 without a Choice Scarf is 183.
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My Modest Mega Mewtwo Y has a Speed rating of 189 at level 50.
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My Jolly Garchomp with a Choice Scarf has a Speed rating of 253 at level 50.
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My opponent's Ambipom used Last Resort before my Mega Mewtwo Y and Choice Scarf Garchomp could land a hit.
That's enough proof that Pokemon X/Y user JUKAI is a scumbag, because there's no way that a legitimate Ambipom can use Last Resort (a non priority move) before my Mega Mewtwo Y and my Choice Scarf Garchomp.