Climb all the way to the top of mount silver. (You need a pokemon with the move rock climb.) There, at the top, you will meet trainer red!
Advice for beating him:
All of his pokemon are level 80+
Pikachu. Use a strong ground-type move on him. Pikachu lacks defense.
Snorlax. This one is hard to take down, but use a powerful fighting type move.
Lapras: Scince it is hailing, Lapras won't be affected by the hail. Use electric, rock.
Venasaur. Use fire or flying on him. NOT WATER
Blastoise: Grass type will have him crying. I recommend teaching a pokemon frenzy plant at blackthorn city.
Charizard: Use a water type pokemon. Once again, teach a pokemon hydro cannon at blackthorn move tutor. I reccomend Ferlagatr. I used him!
Oh, by the way, you can also catch the legendary birds after earning 16 gym badges.
Zapdos: Look on route 10 bt yhe power plant.
Moltres: Search for a hidden cave in mt. silver. You need surf as well as rock climb.
Articuno: Look in the seafoam islands. The maze is hard! Don't give up!
You have to beat all 16 gyms.
Blue is the viridian gym leader and red is on top of mt silver once you beat all the kanto gyms
You have to beat the elite four then go to Kanto and beat all of their gyms to use rock climb.
beat the power plant and then beat snorlax go through digletts cave beat gyms go to pallet town then surf in an instant your there
cerulean cave after you beat all the gym leaders
there is another region in the game that is red version and you have to beat all the gyms.
Go to Kanto, beat the gyms, go to Mt Silver and beat Red.
Beat all the kanthan gyms and go to mt.silver and beat red
you need to beat all gyms, the E4 twice and red.
You have to beat all 16 gyms.
Re
beat all 16 gyms and go talk to prof. oak in paett town
after you beat all 16 gyms, go to the bottom left exterior of the power plant.
Just beat all the gyms. The first one is in Violet City
You have to beat all 16 Kanto gyms, then talk to professor oak.
beat the all the gym leaders
Blue is the viridian gym leader and red is on top of mt silver once you beat all the kanto gyms