Also, does Keen Eye operate on Megas like Prankster does (in that, on the turn of MEvo, the priority boost still occurs)? If so, MPidgeot is pretty scary as a one-time super-RK.
Mega Evolution has the same priority as a switch and always goes
after all switches -so yes you would Pursuit-effect a fleeing target first turn
but before you Mega Evolved. In Mega Pidgeot's case, it could miss with a move on an attempted Pursuit-effect hit, and of course hit less hard than you're thinking.
In addition, MSableye basically guarantees a Knock Off on Chansey while being basically impervious to everything if it stays in.
That's pretty neat, and an argument for dropping the BP cap to 60. I was thinking 80 not only because that's Pursuit's damage when Pursuing, but also because of moves like Drill Peck and so on. I'm really reluctant to drop below 60 BP because there are a
lot more holes below 60 BP, so it's a lot more likely that a given Keen Eye Pokemon will have nothing, or nothing that makes sense to use, that benefits from the effect.
A mechanical question I had also overlooked -Drapion gets Infestation, which is a partial trapping move. One might expect that it could Pursuit-Infestation to thus waste an attempted switch entirely, which is not
remotely what I'd been imagining when I came up with the idea.
Mind you, as far as I'm aware both the actual Pokemon games and Showdown are coded such that what would happen is the switch would occur anyway -they both function by just refusing to allow a switch-order, being unable to block U-Turn for instance- but I still want to be quite explicit that shenanigans of that sort are
not the intended behavior. (So if this gets coded down the line such that Pursuit-Infestation
does cause a switch to fail outright, there's no ambiguity: that's wrong)
This is a great point. To keep the risk/reward factor intact, how about we use Ghoul King's idea of putting a (40?) base-power cap on the attacks that are able to receive the 7+ Priority and 2x Power bonus against fleeing opponents?
I edited out the power doubling in the first place because it was a terrible idea, I don't see any reason to bring it back just because the BP cap is being imposed.
Or we can just limit the Pursuit-like effects to attacks that already ignore accuracy and evasion modifiers (since Keen Eye isn't doing anything for them anyway.)
I don't think Drapion gets any Accuracy skipping moves, for instance, or maybe just Feint Attack? (But really, at that point it should use Pursuit and take Battle Armor or Sniper) But that's really just too narrow a set of things that benefit, such that most Pokemon with Keen Eye will have one or two moves that benefit in their
entire learn-list. Limiting it to 60 BP includes all of those except Aura Sphere and Vital Throw (And Vital Throw benefiting would be extraordinarily silly and possibly not work mechanically) while giving some real options -Drapion might finally run Fell Stinger, for instance!
IMO set the power cap to 50 since nobody uses anything that's base 40 anyway, and the number of moves available that are that weak (base 40) is vanishingly small.
There's almost no moves that are actually 50 BP. Mostly you jump straight from 40 to 60 without seeing much between. (Karate Chop, Tackle, Rock Throw, Confusion, Cut, Bonemerang, Snore, Metal Claw, Poison Fang, only when it's useless Weather Ball, Poison Tail, only when its useless Payback, Charge Beam, Smack Down, Flame Charge, Struggle Bug, Gear Grind, Clear Smog, Parabolic Charge and Draining Kiss are it for 50 BP, with Vine Whip notable as the sole 45 BP move of the game) Most of the ones that do exist aren't available to Keen Eye Pokemon...