Once you gather all 8 Johto Gym badges Professor Oak will call you and tell you to visit him and then he gives you the masterball.
there is no item like a mater ball.
Nope
use it
event
No Apricorn will let you get the GS Ball in Pokémon SoulSilver.
Simple, YOU CAN'T
With a Poke Ball
In Pokemon Soulsilver, you can get a Net Ball from Johto in Goldenrod City. You have to win it from the Goldenrod Dept. Store lottery.
there is no gs ball introduced in soulsilver, only gold silver crystal japanese versions.
You can use any type of Poke Ball that you want to catch Spheal in Pokemon SoulSilver.
you can get 1 master ball
MATER code d2006a02aa68