Admittedly, I wish that the 'unobtainables' were obtainable, just through some special scenario or hoop that you have to jump through.
I remember once when there was a supposed "secret" to catching Mew. Where you would, if I remember right, have to talk to the guy who teaches you how to catch a Pokemon, let him show you how, then fly immediately down to Palet Town and use Surf until you arrived at the little truck that was to the South. Walk around it three times counter-clockwise, then look inside of it's hood, and you'd find a Mew that would then attack you (level 70).
Now see, to get Mew? I'd do that. I actually did it, but there was no Mew inside...so I tried about three times before giving up and breaking out the Gameshark. Then again, I was never inclined to "Catch 'em All". I was more than happy to make up the biggest, baddest team I could at the time of Pokemon I enjoyed using, and do my best to beat the socks off of all of my classmates. I still am doing so, minus the classmates, and more of going to Gamestop at events in order to get some wins under my belt.