Well, I already got a Vulpix...I've caught all the land-based Pokémon in every area; I forgot to count Village Bridge before, but I corrected this today and Seviper - which didn't stay in the ball on R11 - finally stayed put after I fought it to submission with weaker opponents and lost two of them. I'm currently in the Undella area surfing and fishing, and I have Remoraid on my search list, among others. I've also read that it must be in the party for another Pokémon to evolve; I found that interesting. I will check the water in Route 14 later on Bulbapedia, but there may only be a couple to find at best. I did finally get the Lapras from Village Bridge (5% encounter rate with 95% Basculin in Surf Spots).
What do you have on the National Dex that I might be missing? I'll someday be importing beauties from other games, but for now, I'm trying to trade for whatever I can that I need. Someday, I'll need my own Action Replay and clone the legendaries I have, putting them up for trade seeking other legendaries; however, I will be localizing the search for rarities like Jirachi to this forum. I actually executed a trading plan involving some clones in my direction that should cover most of the ones I would have been missing, but there are still a few I'll figure out over time.