you can use it when ever you want but i recomend using it on mewtwo
there is only one masterball
Find it on a route in the grass then use the masterball.
for Pokemon there are no codes
the masterball is for any Pokemon you want, it can catch them without fail ( it will ALLWAYS work ) . you are supposed to use it for mewtwo though. :P
defeat all rockets and giovani then a man will ive you a masterball
i masterball
when you find that Pokemon if you have a master ball with you use a pokeball and you will capture it
The legendary dog you find the dog that has a type advantage over your starter.
No but you can have a friend trade you a Pokemon holding the masterball they got.
You get the masterball when you go and defeat Team rocket
you cant but u get it from the Silph Co. president.
The president of silph co will give you one.