Huh...that's weird. Why would it have Noble Gohei of all things? The thing doesn't even exist in the database o_O;; Talk about some errors.
The attack in question must be used, and there's a % chance of Koishi learning it, which depends on the difference between her level and the enemy's level. If her level is LOWER than the enemy's, then she gets +X% to the base learning rate (meaning it's harder to learn them. If her level is HIGHER than the enemy's, she gets -X% to the base learning rate (meaning it's easier to learn them). She does have to be able to act though (meaning she can't be inflicted with Death, Petrify, Venom, Paralyze, etc. Don't think Blind is part of this, but it really should be. Think about it...how can she learn something if she can't see it, right? It's the same deal with Strago in FFVI there, but I never implemented it).
It doesn't have to hit at all, or even target Koishi. Just has to be used.
In other news, I MAY have a spoiler thing to show here, involving new sprites added to the game. Some aren't as spoilerish though, such as Tenshi who got a brand new boss sprite, but the others will be, and thus will be posted in a blog on RPGMaker.net and linked here. In addition, Valley of Corpses, Valley of Corpses - Dimensional Rift, Frozen Fields, and Frozen Fields - Dimensional Rift are all 100% done mapping wise (no eventing started yet). Someone else is working on Ruins of Vina, so once he's done with that, I'll do the Ruins of Vina - Dimensional Rift map, but for now, updating Myouren Temple and then will finish that dungeon.
Current Myouren Temple screens:
Second screenshot is a bit old now as it's been updated a lot more since this screenshot.