After beating the League, go to Prof. Elm. He will give you a ticket to go on S.S. Aqua. Go on S.S. Aqua, and defeat the trainers there. You will also have to find a man's daughter, she is with the captain of the ship. Then go for a rest in your cabin. When you wake up, you'll be in Vermillion City in Kanto. You can fight the gym leaders in Kanto and earn more badges. You can also catch more Pokémon in Kanto, and eventually you will be allowed to go to Mt. Silver. When you get to Mt. Silver find Red, deep inside the mountain, and battle him. After you've defeated Red, you can train up your Pokémon, making better teams and fighting people competitively.
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By beating the elite for then Beating the champion.
hes is the pokemon league champion
You can't!
all you half to to is go there whenever at night.
upgrade to the national dex and see and catch every Pokemon