I wasn't feeling very eloquent last night, which is why I came across how I did.
The idea as you originally presented it had many omissions, and it would have taken a lot of planning just to come up with a working model (even before you tried implementing it). The main issue is the number of Pokémon a player could catch, and duplicates of individual species which might be confusing (you could have a whole map of Rattata and not know which one is your HM slave). Working around these problems, as I said, would be difficult and probably unwieldy in the end.
The idea of showing some of the player's Pokémon in the field would be fine if it was only in addition to the PC, as a bit of decoration. There are plenty of things you could do with that, such as letting the player choose which Pokémon are outside and even adding some breeding mechanics. My dislike of the idea is that you want it to
replace the PC, which leads to the problems I've mentioned.
Instead of having one grandiose map filled with potentially more than 649 Pokemon (depends on how many gens you want and how many duplicates the player may have), I'd try breaking it down a bit. In fact, here's what I think would actually work pretty nice, and is somewhere between your idea and Maruno's: have a map that corresponds to each box, which has the usual limit (I don't even remember how many that is anymore). So if a box can only hold 30, that map would never have more than 30 events, and you could have themed maps or even mixed ones (the difficult part will be getting Pokemon to spawn and remain near their respective environments, if you go a mixed map approach).
This is the best way forward, I think, but it would mean major changes to how storage works, such as lowering the total number of Pokémon allowed and adding limits on how many Pokémon associated
with each environment you can own (e.g. your water field may be empty, but if your cave field is full you can't catch any more Geodudes). You'd also need to bear in mind that they player may also want to store a party Geodude, so those environment limits must also count the party Pokémon.
If lots of events didn't make RMXP lag, there wouldn't be much of a problem with these limits. However, they do, so there is. With 649 species existing nowadays, and a limit of about 30 events per map, you'll need a whole lot of fields. And how many fields of each type should you have? Well, if you're clever, you may be able to let the player change fields to different environments (like they can with box wallpapers).
Some players like to group their Pokémon differently, e.g. "event Pokémon", or "Pokémon that need training". This simply wouldn't be allowed with your idea.
There would still be the management problems, though. The player wouldn't be able to tell at a glance which Rattata is which, they couldn't quickly cycle through all Pokémon in a field to find a particular one, and so forth. It's a lot of work for the player to do, and that's an important thing to remember.
My whole point is I hate the "pc" I would love some personalization with "my" Pokemon that I've caught. You know?
Anyways again thanks I'll take help but please if you don't like the idea or think it dumb or just can't add anything to help a fellow gamer out just don't reply, if you can though please I'm all ears Er I guess eyes lol. Unfortuantly I can't trial and error yet I'm really busy and put of town but any info I get I'll be sure to make attempts when I get a chance :) again thanks! I'm one step closer to my dream lol
There's nothing wrong with wanting to be different, but this is
very different and almost certainly not as good as the existing PC storage system (unless you come up with something really special, which I haven't).
A word about your last paragraph: you should accept all opinions, not just the ones you like. "If you don't like it, don't reply" is not a good thing to say. If anything, you should be wanting constructive criticism only (which can be either good or bad), and I thought mine was that because I pointed out issues you may not have thought of. It doesn't matter whether I like or dislike this idea; I'm still helping you by telling you what you're overlooking, and possibly showing how big a task it is.