Once you beat the Elite Four, and your rival, you become the Pokemon champion. You've pretty much beat the game. There's nothing more for you to do, other than explore the Unknown Dungeon in Cerulean City, and catch Mewtwo, and finish filling your Pokedex. He is lvl 70, so be prepared.
If you lose in the elite four you have to restart the elite four. :(
you get laid
yes swarpert is a greatest Pokemon to defeat elite four
You go and have a tug
Fire and water are the best combination to beat the elite 4.
I would suggest fighting the elite four with a water, fire, ice, rock, electric, and fighting type pokemon.
finish the nation pokedex
Then you beat them:)
nothing
Wailord
red or the elite four if you beat red the elite four Pokemon will be jacked up or red again after you beat the elite four his Pokemon are the same levels as before
nothing new