Take a look at my Pokémon Red - Gen. II Graphics Patch!
Play through the original Pokémon Red we all know and love with huge improvements such as all new sprites from GSC!
No more pixelated "grainy" back sprites!
It's kind of like a sneak-peak to alot of the features included in my main hack, Pokémon Prototype!
Leave your feedback in the hack's thread!
And while you're at it, tell your friends!
Thanks a bunch!
Relating to your question in Prism's thread, with a hex editor, you're practically capable of doing anything as long as you've got the knowledge for it. If he said all the tools he used are listed in there and there is no "pokemon inserter", it's quite certain he has added the new pokemon using a hex editor.