Short answer: You don't.
You can't
u can not that only in hacked game >.<
You trade 50 peolple and talk to a spy in Pokemon center castelia city
Lols, you can't find 99 masterballs, someone have tracked you. But u could get 99 masterballs! If you make your Pokemon hold a masterball, then clone him, if u clone him right will you have 2 pokemons, and both is holding masterballs.
u can't
get an action replay and it comes with that code
You can't
yes
Maybe it was in the right item slot.
1 Masterball, unless you recieve a traded pokemon which is holding a Masterball
you can only get 1 master ball from prof. juniper without cheating