Oh hey, this thread got revived :o
I've seen that set a couple of times, Dark Fallen Angel, and I must say, it's quite a surprise to face. For that last slot, would a status move be worth a try? For example, you could use Thunder Wave, and since Deoxys-D is pretty fast with a Choice Scarf, it could cripple Pokemon like Latios and Keldeo that don't mind the Choice Scarf as much. Spreading paralysis also helps if you have a slower sweeper or what have you. You could also use Toxic, which gives Deoxys-D a good way to hit Jellicent and Hippowdon, among other bulky annoyances.
In a similar vein, I've been enjoying TrickScarf Jirachi as a lead lately. The set itself is pretty standard:
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Jirachi @ Choice Scarf
Trait: Serene Grace
EVs: 252 Atk / 4 Def / 252 Spd
Adamant Nature (+Atk, -SAtk)
- Trick
- Iron Head
- Ice Punch
- U-turn
A lot of people on the ladder seem to expect Jirachi to sit there and set up Stealth Rock on the first turn. I've been finding this set effective at crippling those opponents on the first turn. Generally, the Pokemon in question gets stuck with a Choice Scarf, and then I go for the U-turn and get a Pokemon in for free, usually something like a Spiker or what have you. This is also insanely helpful against Deoxys-D, as many start the game off with Stealth Rock, only to be unable to set up any Spikes and having to take a super effective U-turn in addition to whatever the next Pokemon I bring out has to offer.
However, I don't have to Trick the Scarf away first turn. If I want to cripple something different, all I have to do is U-turn out and I still get another Pokemon in for free. Unless it's something like a CB tar (which of course has Pursuit), there's not much any opponent can do about it. I get to scout in this scenario too, which helps me out later on in the match.
This set really helps setting up hazards early-game, which is one of the main reasons I like it so much: say I have a Deoxys-D; if this set does its job, then it is in the clear to set up Spikes. For this reason, I've been using it to support a hazard-centric offensive team.