Regarding your point, there were some things I wanted to say to this so I'm going to make myself a little comfortable here, if you don't mind.
In your comment you said, "[H]aving someone spending two weeks, as that's how rarity has been handled so far, on a route that may only be a few days or so to travel normally, is kind of unrealistic as it is." You also said in your next reply to Hat:
"If everything is suddenly available in multitudes of places, it kind of takes away from the challenge. That's not what I'm saying though? I'm saying make MORE things available in more places, not spread out the few we have - and even the common things are in ridiculously few places. Not to mention how swarms and such should have drastically altered the environment this way or that at some point down the road anyway, as it has.
First: honestly, I don't see why that would be unrealistic. Even in the actual video games, we as players will spend hours running through one patch of grass in search of that one Pokémon you just can't catch, when normally walking through that particular part of the region might take just three minutes. For a character to spend two weeks on a normally three-day because he heard there was a rare Pokémon there he really really wants to see or catch, as long as it is in-character for said character, does not sound unreasonable to me.
Whether a character does find the Pokémon is, really, up to his or her mundane. Put bluntly, a mundane should know their character enough to say that if their muse has a ridiculous amount of luck, they will run across the rare Pokémon easily; if the muse is characterized by terrible luck, they won't find it either for a long time or not at all. How that is handled is the responsibility of the mundane, and should be left up to them.
However, just because it is up to a mundane, I'll state here that a rare Pokémon is a rare Pokémon. Like in our out-of-game world, there are certain species found only in a few areas around the globe, and it's logical that this is the same with the Pokémon. It makes getting to those certain areas that hold those Pokémon a challenge, which is not unreasonable or unrealistic and, taking Route_29's premise into account, not a bad thing.
In addition, say that a character does catch a rare Pokémon. Obviously, it is up to them to breed that Pokémon or not. The concern that arises then is the quantity of eggs that Pokémon would breed, but before I get to that, I'd like to point out that sources such as Bulbapedia has, on each Pokémon species' page, a chart that shows the male-female ratio of said Pokémon.
For example, there are about four times more male Eevees than there are female Eevees, which means that roughly for out of five times an Eevee mates, the Eevee would end up being the father and unless - such as in Souji's case - the "mother" is a genderless Ditto, the resulting egg would not belong to the Eevee species.
I'd like to think that mundanes and trainers would for the most part take that into consideration... but what I'm trying to say here is that there are multiple factors that tie into the rarity of a Pokémon, and even if it could be caught, whether it can breed often is also debatable, and the mods and other players commenting here have addressed the egg cap. A rare Pokémon may lay less eggs than a common species such as Rattata, and as such, even if the trainer goes down the road to breederdom, putting a cap on eggs, and putting a lower cap on the rare Pokémon species, can help control that.
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In your comment you said, "[H]aving someone spending two weeks, as that's how rarity has been handled so far, on a route that may only be a few days or so to travel normally, is kind of unrealistic as it is." You also said in your next reply to Hat:
First: honestly, I don't see why that would be unrealistic. Even in the actual video games, we as players will spend hours running through one patch of grass in search of that one Pokémon you just can't catch, when normally walking through that particular part of the region might take just three minutes. For a character to spend two weeks on a normally three-day because he heard there was a rare Pokémon there he really really wants to see or catch, as long as it is in-character for said character, does not sound unreasonable to me.
Whether a character does find the Pokémon is, really, up to his or her mundane. Put bluntly, a mundane should know their character enough to say that if their muse has a ridiculous amount of luck, they will run across the rare Pokémon easily; if the muse is characterized by terrible luck, they won't find it either for a long time or not at all. How that is handled is the responsibility of the mundane, and should be left up to them.
However, just because it is up to a mundane, I'll state here that a rare Pokémon is a rare Pokémon. Like in our out-of-game world, there are certain species found only in a few areas around the globe, and it's logical that this is the same with the Pokémon. It makes getting to those certain areas that hold those Pokémon a challenge, which is not unreasonable or unrealistic and, taking Route_29's premise into account, not a bad thing.
In addition, say that a character does catch a rare Pokémon. Obviously, it is up to them to breed that Pokémon or not. The concern that arises then is the quantity of eggs that Pokémon would breed, but before I get to that, I'd like to point out that sources such as Bulbapedia has, on each Pokémon species' page, a chart that shows the male-female ratio of said Pokémon.
For example, there are about four times more male Eevees than there are female Eevees, which means that roughly for out of five times an Eevee mates, the Eevee would end up being the father and unless - such as in Souji's case - the "mother" is a genderless Ditto, the resulting egg would not belong to the Eevee species.
I'd like to think that mundanes and trainers would for the most part take that into consideration... but what I'm trying to say here is that there are multiple factors that tie into the rarity of a Pokémon, and even if it could be caught, whether it can breed often is also debatable, and the mods and other players commenting here have addressed the egg cap. A rare Pokémon may lay less eggs than a common species such as Rattata, and as such, even if the trainer goes down the road to breederdom, putting a cap on eggs, and putting a lower cap on the rare Pokémon species, can help control that.