you can't let him lead you always lead
simple you capture or beat ho-oh.
After you beat red
nothing
Give it an experience Share and let another Pokemon battle for it.
you go up the stairs in the Pokemon center and the lady in the right will let you battle
Im sorry but you have to get all 16 badges and the police man AKA: gay will let you pass
He is the Hoenn Champion. But he isn't in Soul Silver for a battle. He'll tell you that Latios is roaming Kanto. He let's you have one of the Hoenn Starter Pokemon. He also let's you trade with him.
Let your Pokemon faint. Then you'll go to the lsat Pokemon center you were at. Or if you have someone with dig, use it to get out.
You first have to beat the Elite Four for the first time and then you have to get all of the Kanto Badges and he'll let you pass
Defeat all of the Johto and kanto Gym Leader, talk to Prof. Oak, and he will let you go there and challenge red
I think you need to get Lugia (Soul Silver) or Ho-Oh (Heart Gold)