good idea<br/>In pokemon R/B/Y/G/FR/LG you obviously have your rival, most commonly referred to as Blue, with you  being the protagonist. every time you encounter your rival after the first time he has a rattatta, which evolves into a  Raticate. He has it in every encounter until your battle on the SS Anne, which is the last time you see it in his party. The next time you see your Rival Blue you're in Lavender Town,  where he is in the pokemon tower, where dead pokemon are layed to rest. He ask you what are you doing there, you had no business there. When you battle him there, he has no Raticate in his party anymore. His attitude toward you also has a bit more spite and malice in it.<br/><br/>This all in mind, the theory states that on the SS Anne battle, you injured his Raticate so severely that he could not get to a pokemon center in time to heal it, dying on the way there. He uses the death of his fallen comrade as a new drive for him to trump the league and reign as champion. There was one problem for him though. You[ Red] who one upped him at every turn that he thought he was a head of you at, you who inadvertently took the life of one of his first teammates. You who at the end ofit all, let him reign as champion for mere moments before stealing the crown away, as well as his own grandfathers praise. You  took everything from him, and left it in the wind at the top of mount silver...