[Tobes]

Originally Posted by Fat Kebabe

With Skill Swap:
1.If they lead of with their bouncer:
Skill swaps and gets up at least one layer

What if Espeon Baton Passes (likely) or Xatu U-turns (less likely but still a possibility)?

2.If they lead with something else:
Skill swap on the switch and get up at least one layer

And what if the opponent leads with something like Arceus or Giratina-O that puts you in immediate danger of losing Deoxys-S, without getting any hazards at all, if you Skill Swap at that moment?

With Dark Pulse:

1.Dark pulse twice, sash broken you might not even get one layer up.

2.Dark pulse on the switch and get up at least one layer. (if they not has Sdef Xatu lol)

What Im saying is that if you really need to get up hazards Skill Swap guarantees that 100% (ok not against scarf Darkrai), you cant argue that.

Im not saying people uses Sdef Xatu, but I think you at least have to consider all possibilities.

Sure, you have to consider all possibilities, but you also have to consider practicality and relevancy. You're using one moveset (which is highly contested on Deoxys-S might I add) to deal with one relevant threat and one barely considerable threat, both of whom could just as easily be handled by slapping a Tyranitar on your team. Dark Pulse might not be as effective as Skill Swap against those threat, but it is far more effective against other, more relevant threats.

Also, even if Dark Pulse might be more useful in general this is still a thread for unorthodox movesets right?

This is not just a thread for unorthodox movesets; it's also for established and/or underrated sets. Reread the OP or the parts that Faint quoted. Furthermore it is for effective sets. Unorthodoxy by itself is not enough justification. The sets have to be effective and worth running. You're entitled to your opinion on what you feel is worth running, but speaking in terms of an analysis, Skill Swap would be found in Other Options at best.

Scarf Genesect max speed: 489
Deoxys-S max speed: 504

252 Atk Deoxys-S Fire Punch vs. 4 HP / 0 Def Genesect: 276-328 (97.18 - 115.49%) -- 87.5% chance to OHKO

Pragmatically, yes, Genesect is unlikely to U-turn, but it is still a possible scenario and definitely worst-case scenario. That possibility is made even more unpleasant (and more likely) if the opponent is packing a spinner, since Deoxys-S will be forced out to a spinblocker, or, even worse, will lose all of its hazards to Rapid Spin and be killed if it stayed in.

To add to this, in order to run both Skill Swap and Fire Punch, you're either giving up Stealth Rock (and neutering Deoxys-S's biggest niche) or leaving yourself completely at the mercy of opposing Deoxys-S.