If it's like heart gold for this, then catch the red guarados, and u should get a red scale, go to mr.pokemons, house, and he will want to trade your red scale for his exp.share. Say yes, and u have an exp.share
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In SoulSilver, Mr. Pokémon will give you the Exp. Share in exchange for the Red Scale that you had received after defeating or catching the Red Gyarados.
Use the experience share item and attach it to a pokemon that you want to gain exp. Also if you start with the weak pokemon and swap out for a stronger pokemon, then half the exp goes to each pokemon
Give Mr Pokemon a Red ScaleGoldenrod Lottery, match 3 numbers.
no you can trade soulsilver pokemon to black
You CANNOT LEGALLY download Pokemon Soulsilver.