Mewtwo I guess????
You should use it on one of the 'roaming' pokemon, like Cresselia in Diamond/Pearl/Platinum.
there are 2 master ball s and a master ball is rare you can only use it for kyogre requaza groudon salmence fly gon and the rest of the strongest Pokemon a master ball always captures a Pokemon no Pokemon can break out its in possible
you can use master ball in caught the groudon
no, you don't have to use your master ball on it. you could use it for any legendary Pokemon like mewtwo, or... you know what i mean!
giratina
Master Ball
Mewtwo I guess????
Witchever you want, but you should probably use it on rare or legendary pokemon.
The best ball to catch Deoxys is a Master Ball or a Timer Ball! Trust Me!!! Pokemon Master
if you did not want to use a master ball on a Pokemon you did not want to capture, if you did not save it then you could restart it and still have the ball but you also get in a trade attached to the Pokemon.
You should use it on cresselia or mesprit because they run away
Definitely Thundurus. You can get 2 Master Balls in Black and White. You should save the second one for shinies or event pokemon.
You cannot find a second master ball however you can trade Pokemon to get another Pokemon with a master ball or use an action replay
You should use it on one of the 'roaming' pokemon, like Cresselia in Diamond/Pearl/Platinum.
Use ur master ball only for latios or latias.......since this Pokemon only appears once in the game and also tries to flee!!!!!
Answer:Well pay close attention i think you should use it on an ancient Pokemon not just ordinary Pokemon because ordinary Pokemon can be caught with an ultra ball But if you ask me when you come across a Pokemon that you want and LOVE and it cant be caught with an ultra ball use an masterball !!!!!! I did the same thing and it tottally worked i caught a azelf with my master ball and i caught a uxie with an ultra ball ( SIMPLE MAKE IT WEAK) and ive been trying to catch mesprit since but takes a while!!