I've heard reports that the "Stoneless Evolution" trick has been ficed in yellow, so the best option would be to simply catch a Raichu.
Check the first post on the basics on the Mew / ditto Glitch. You can use the ditto Glitch variant to get one. All you'll need is a pokemon with a special stat of 85. If you use a gameshark device, then the "catch any pokemon" code would be 0155D7CF
Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming