As you may know, Masterball is the best ball. I have both yellow, silver and gold. After I got the Masterball in either silver or gold, I traded with yellow. By making a pokemon hold the Masterball you trade it and in yellow you can clone it to have more of the best ball in the world. I would guess that Masterball is a lot easier to use when catching Mewtwo that a pokeball.
To catch a pokemon, you require a Poke ball, which you can buy from a poke mart.
with a poke ball
you catch it with a poke ball
With a Poke Ball.
With a Poke Ball
get a poke ball and catch it Problem salved
Master ball
use a poke-ball on it
catch it with a Pokemon (normal) buy like 50 or dive ball or master if there no other lengendary Pokemon
You'll need a Pokemon and a Poke Ball.
No, that's a myth. Just throw a Poke Ball and hope you catch the Pokemon.
with a poke' ball