Once you beat the very powerful trainer red, you can go to proffeser Oak's lab, & choose your 1st generation Pokemon starters,
You can now have full acsess to the Silph co. in Saffron city, when you meet Steve, you can go to Proff. Oak's lab & get your 3rd generation Pokemon starters.
you can also go to the cave on route 47, & catch Groudon.
If you beat trainer red go to Mr Pokemon's house and he will give you a red orb.
after you beat trainer red and collect all 16 gym bagdes he is at the power plant in kanto(surf to get there).
Beat Pokemon trainer red on top of mt silver. you can only face him once you beat all 16 gyms and the elite four twice.
yes, after you beat trainer red, (ash), go to prof. oak's lab with an empty space in your party.
Trade in good pokemon.
He disappears until you beat the Pokemon league again.
after you beat red in Mt.silver
beat elite four rematch
Earn the national Pokédex, go to the mountain where Red is and beat him.
defeat Pokemon trainer red in kanto . reach him using rock climb
use high level Pokemon
he is strong so train your Pokemon alot.