Originally Posted by Finchy
Go to lavendar town, and get the radio card. Then click on the snorlax, an it will give you the option to place the radio by his side (If memory serves me). Once that's done, he wakes up and attacks.
I think you have to stand next to it and manually tune your radio to the new channel you received with the radio add-on card. When you exit the menu and talk to it, it should fight you...
Or maybe you just have to put it next to lax. I don't recall.