Verified answer

You start the game(save when you get out the house) you get your first Pokemon right off pro oak you then do his little task thing cant remember what it is anyway the very first time you can, catch any Pokemon catch one suppose pigey store the Pokemon you got from oak then change to the next box

switch off (as fast as you can as the saving takes only about 1 or 2 seconds)

you begin again when you first leave your house then pick the other Pokemon you want from oak then do the little task thing then catch a Pokemon again check your Pokemon box there will hopefully be all the Pokemon you had and have .

Read more: http://wiki.answers.com/Q/How_do_you_get_all_three...

The originals? Wow, didn't think anybody had those... To get Mew, so I've heard, you have to catch ABSOLUTELY every pokemon in the game, fill the pokedex and all that (gotta catch em all!) Once you've done that, you go back to Prof. Oak, and Gary is there, and he gives you/tells you mew is. I dont know if this works, only heard it off a friend. Most likely it was probably a promotional event or something similar, so your chance has most likely gone. If you want it, you're probably gonna have to set up some epic trades. Sorry!

I'd need more information; are you utilizing an emulator or the actual game boy version?

There IS a way, but, of course, the emulator version would be easier.

Which are you using?