Question

I was wondering if there is a way that isnt cheating that you are able to get these pokemon.

Answer 1

There was a wi-fi Mew event in Japan a few weeks back, so it's possible you will get a chance in US/Europe.

I haven't heard anything about Deoxys but there are sometimes real-life events (like at the pokemon movies) where you can pick up rare legendary pokemon.

I post news to the front page of the site at http://pokemondb.net so you could keep an eye on that every week or so.

Answer 2

You could get Deoxys in an event in FireRed or LeafGreen...I don't remember how to get mew...sorry.

Answer 3

Hacking or event.

Answer 4

There's actually a way to get Mew in Gen1 without using hacking, but using glitches. Doesn't mess up your game like hacking does.