To beat the Pokemon Trainer/Champion Red, I suggest going to guides and/or walkthroughs online to help you.
The easiest way to beat Red is to have Pokemon that are super-effective against Red's Pokemon. Plus, bring a lot of hyper potions or max potions, as well as revives and max revives.
Well the only way to beat Red (Ash) is to have Pokemon about the same level as his Pokemon's and have super-effective moves against him.
Just a hint, here are his Pokemon:
Pikachu
Lapras
Charizard
Venasur
Blastoise Snorlax
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.
he is strong so train your Pokemon alot.
beat red and go to prof. oak
You can always catch Groudon. And Rayquaza too.
pokemon soulsilver-you get it when you beat red then go to prof.oak in pallet town.
first you beat all 16 gyms go beat elite four beat red and he will be at the embedded tower after you get the red orb from mr. Pokemon
I think it's beat red
If you beat trainer red go to Mr Pokemon's house and he will give you a red orb.
If you mean how to consider yourself as beaten the kanto region in pokemon soulsilver, then you should find zapdos,moltres, and articuno. You should also beat Red (Ash Ketchum). Once you do that, you can catch Mewtwo.