The problem is that he need to get a Swords Dance in order to kill his threats not named 0/4 Starmie, but also a Tailwaind/Agility to outspeed them (bar priority users such Mamoswine). So if the opponent switch in the counter while you get only one of the two boost you are too slow or not enough powerful to get the OHKO and you're probably forced out.
Maybe you can use something like Tailwind/U-Turn (as proposed before) but then you've only two moveslot remaining.
He can also run something like Agility/SD SubPass or similar but I don't think it could work too well.
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