I saw that in the thread. And you're right in guessing that I'd rather have the three of them all be roaming instead of having two show up in predefined areas! There were a couple of things that put me off of that solution, though. Having to insert tons of routines like that to reach a means to an end feels cluttered for my purposes. It's impressive and wonderful nonetheless, and I'd be willing to settle with that. The second, and real bummer for me, is the bug FBI noted at the bottom about "using" a move before fleeing. Things like that are quick to put me off from doing them, as I want this hack to feel as solid as possible. There's a few, regrettable bugs in it already, but I hope to get them out of the hack by the time it's all said and done. It's the same reason why I haven't implemented the Exp. gain on capture in my hack.
My ideal setup would be to send out all three roaming legendaries using the same code base that FR/LG already has. That'll require expansion to do, as it'll only send out one based on starter choice. It'd use the least amount of extra code, and I'm fine with it not being up to spec like other gameplay features. Although, I'd be plenty happy having an option for the modern style as well. Oh, options...
Geez, I've been doing a lot of listing, numerating, and dreaming today! I hope nobody takes me for a beggar or pedant.