This could be a little bit off topic. I'm just very curious.
So is there any other way you can obtain Mew in the green/red/blue without glitching or hacking? There was no wifi event before and I read Mew in the early games is only tradeable. But where can you get it?
You can only get Mew via the Mew Glitch (or hacking, obviously) in RBY. Bulbapedia only says trade because that is the default when there is no other legitimate way to get it in that game.