Prevents a switch in that threatens Scrafty from setting up a Swords Dance or Nasty Plot expecting the Parting Shot, and lets it sneak out safely to come back in for more Parting Shot fun. It functions like a two turn Memento that doesn't sack your user but still provides great momentum in cases where Scrafty has to switch anyways. It can scout double switches as well. Usually you'll go straight for the Parting Shot or Knock Off but if the enemy is packing something you don't have a great answer to mid to late game that Speed drop would save your bacon.
Scrafty doesn't have many other options to support its team mates anyways. May as well pack a situational move for assurance when it has the slots for it.
But if you immediately use Parting Shot after coming in while they switch to their counter, your speed is irrelevant…why would you waste a turn dropping their speed in order to be faster with Parting Shot when you could just skip that and achieve basically the same thing? Unless you're trying to double cripple them by dropping Att, SpA AND Speed, this is just a waste of a turn. Here are the possible scenarios:
1) Scrafty switches in on something it forces out
2) Opponent switches to appropriate counter as Scrafty uses Scary Face
3) Scrafty uses Parting Shot as opponent switches out again, giving you momentum but leaving your opponent's Scrafty counter completely unscathed
1) Scrafty switches in on something it forces out
2) Opponent switches to appropriate counter as Scrafty uses Scary Face
3) Scrafty uses Parting Shot as opponent uses NP/CM/etc., leaving opponent -2 Spe and +0/+1 Att/SpA against whatever you switch in
1) Scrafty switches in on something it forces out
2) Opponent switches to appropriate counter as Scrafty uses Parting Shot, leaving opponent -1 Att/SpA and giving you momentum
The only situation in which Scary Face makes any difference is the second scenario, in which Parting Shot is basically moot because the opponent still got a free turn to boost as you used it. This is barely different from just using Scary Face on regular, non PS Scrafty. I don't see why it's worth a moveslot.
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