If you've already won the battle against Red, you may re-challenge him by first beating the Elite 4, and climbing Mt. Silver again. [Heart Gold, Soul Silver]
In the original Gold, Silver, and Crystal, you do not need to beat the Elite 4 again. All you have to do is climb Mt. Silver, as many times as you want, and re-battle him. [Original Gold, Silver, Crystal]
Pokemon Trainer Red has a life and doesn't play Pokemon crystal.
Trainer Red is not in D/P/Pt.
no trainer
Pokemon Trainer Red is on the top of the mountain in the center of the map. All of his Pokemon are lv.63 and up, so have strong Pokemon!
You Don't, That's only in Pokemon Gold, Silver & Crystal. Red is one of the name choices for your character when starting a new game.
Your Rival
Trade in good pokemon.
You get good Pokemon
no but trainer red is basically ash
No trainer has that Pokemon in that game. But you can migrate it from Fire Red and Leaf Green I think.
Pokemon Trainer Red wears red (obviously). He is found at the peak of Mt. Silver. He is the only one there, so you can't miss him.
He is not a gym leader. He is the strongest CPU Pokemon trainer in the Pokemon story. Climb to the top of mount silver and he will fight you.