This is what I meant - Deoxys-S has a niche, which NOTHING else can fill - extremely fast revenge killer which can switch between moves. Being Choice locked (also in a metagame where Shadow Tag/Arena Trap users are available) is not only momentum killer (if you use wrong move), but may end up as 100% trapped and dead Pokemon. This guy totally ignores this fact. BTW about more special attack based spread - if you don't care about Volcarona and Blissey (my team actually does, even if they aren't that common) this EVs spread is better. And on mine one more thing - I still like this little oomph on damage in case I must use physical attack after SpA drop from Psycho Boost. But honestly I would swap Fire Punch, as with only 20 Atk EVs is really weak. While base power difference is noticeable, HP Fire in this case will IMO work better.
Yep, not that common, but better be safe just in case. Although I would need to check some numbers to see if little additional bulk helps to survive certain hits. If it does - you may lower it for example to +1 DD Dragonite level if you feel this is your need (although IMO next best speed bench mark is the one which allows you to outspeed Scarf Genesect or Volcarona after one QD). If not - IMO just stick to this speed number. You have ALOT of possibilities for Speed EVs numbers taking into account that with 0 Speed EVs and Neutral nature you STILL outspeed positive base 130 (by 2 points).
I did some damage calculations, and you're right, Hidden Power Fire is actually a bit more powerful. I always seem to pass over Hidden Power as an option with the nerf and all, but with HP Fire, LO Deoxys-S can OHKO Banded Scizor 100% after SR. Just don't forget to adjust the EV spread according, because with HP Fire, its Speed drops by 1 IV point. The new spread should be 16 Atk / 252 SpA / 240 Spe, to still have the jump on Scarf Garchomp.
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