You Don't
I don't think Deoxes is in Soul Silver.
you can only get Deoxis through special distrabution events, cannot obtain through regular gameplay.
There used to be an event, but now, Arceus is impossible to obtain without the use of a glitch or cheating device.
you hack instead! lol :P jks. You can get it in events but not possible without events of cheating OR hacking
You can't catch charizard in Pokemon soul silver. You can get a charmander from professor oak.
Well You Can Catch:
its in mt silver.
sorry you have to trade it to Pokemon soul silver
No, you can not.
no
No
you catch one in mt silver they are at level 50