I really think you need to make Jolly nature on ScarfRaptor the first slash as it allows Staraptor to outspeed tons of stuff at +1 speed who get wrecked by Brave Bird. Notable examples include Genesect, Darmanitan, Yanmega, Haxorus, Hydreigon, Neutral nature Zard X, and neutral Terrakion. All of these have at least a shot at being OHKO'd after Stealth Rocks even with the Jolly nature.
First thing: Darmanitan, Yanmega, Haxorus, and Hydreigon are barely even relevant in this metagame. Neutral-natured Terrakion doesn't exist in this day and age, and the only way for Terrakion to boost its Speed (besides Rock Polish, which always outruns Scarfraptor after a boost) is with a Choice Scarf, which you can play around fairly easily and almost always runs a Jolly nature, so running Jolly for it is basically useless.
You can also only even KO Genesect if it has a Hasty nature, which IMO, while the most common for sure, isn't worth the risk of it being Naive, which can take a Jolly Brave Bird.
That leaves Megazard X, which is indeed pretty useful to outspeed.
+1 Megazard X and Choice Scarf Genesect (again, if it's Naive you lose) are two reasons to run Jolly. However, they don't make it worth a first slash, especially with the amount of power it loses in return. In short: keep Adamant first, but definitely slash Jolly.
Okay.
Overview
- Competition from Talonflame
Staraptor and Talonflame are barely even comparable. Talonflame does not pack the raw power and coverage of Staraptor, while Staraptor lacks the priority and excellent Speed even without a Choice Scarf. They also form an amazing duo. There are numerous, numerous considerations you have to make when picking Staraptor or Talonflame, but you would choose them for entirely different reasons. It does face some competition as a Flying-type, which you can mention. Make sure you mention some of the nuance in the write-up, though, because overall, this point doesn't hold true.
Choice Band
Use Brave Bird/Double Edge conservatively.
This isn't really very true in my experience. You want to spam Brave Bird/Double-Edge and watch stuff die. That's much of the purpose of Staraptor. That said, mention that U-turn is always a good safe out when you're not sure what to do or you want to save Staraptor for something specific later.
- Most teams have diverse weaknesses, so chances are, the next 'mon is line will be hit neutrally/Super effectively by Brave Bird
I'm not positive what you're trying to get across with this tip; it's not really relevant to how you play Staraptor. Clarify or remove it.
Choice Scarf
- Scarf Staraptor has the fastest Brave Bird outside of the seldom seen Crobat nailing a perfect OHKO on the ubiquitous Genesect before it can even hit.
Talonflame's priority Brave Bird is 'faster'. Also, it can't OHKO Genesect without Stealth Rock damage, so it's not a perfect OHKO by any means. Mention that Brave Bird is a nice revenge killing tool that's still powerful with a Scarf due to Reckless and has great neutral coverage.
Usage Tips
You have say something about U-turn letting Staraptor get out of its counters, but that doesn't cover the whole thing. U-turn is the move you spam throughout much of the game unless you're specifically revenge killing something, much like CB Talonflame. This provides momentum for you by allowing for a favorable switch-in, forcing the opponent to switch out.
Team Options
Mention that hazards are really cool with this because they punish the forced switches caused by U-turn. Unless you can name specific KOs, entirely replace what you have currently about hazards with this reason.
Mention SR + spin Excadrill for the offensive spinner role, as it does the offensive thing well, spins away hazards, and even sets up SR for you. It's pretty much the perfect partner.
Other Options
- Intimidate can be opted for to support walls. Staraptor is sent out first and U-Turns out into a wall who can easily take the coming attack and setup Spikes/SR/Status
Reckless is so much of the reason for Staraptor's viability that I don't even think Intimidate is worth mentioning for any good reason. You can mention that while it does cushion physical attacks, it's pretty much entirely inferior to Reckless because of the massive power drop -- outside of SubRoost, that is, which you mention.
Mention a Sharp Beak set, which can switch moves (that's really nice), but lacks the power of CB and the Speed of Scarf, so is kind of stuck in an odd middle between two extremes, which hurts it.
Checks and Counters
Mention Rhyperior. Also mention sandstorm damage as an additional form of chip damage.
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Since these are all pretty nitpick-ish in nature, I'll just go ahead and call this
QC Approved 1/3 with these changes implemented.