OMG, I soo remember it, back in the 90's when everyone used to play it.
Yeah, you could actually get a mew, in blue version, I got one, google it, but it was a gliche, which involved battling random trainers, and then flying to certain locations, doing limited steps, and you'd encounter it.
That's the only way to get one apart from the special events.
I remember getting one aswell from someone who traded it, those to mews we duplicated so many times though for crystal
Now, all of the pokemon seem the same, and I'd rather play the originals any day.
But that truck near the ss. anne (Yes, I remember the name), and that random island, now that intrigued me, but 10 year olds are intrigued by everything.