A Cherish Ball does not do anything special it is just a special Poke Ball that Nintendo have opted to use for special event Pokemon however if the Cherish Ball was capable of being found in-game then it would work in the same fashion that a regular Poke Ball and a Premier Ball does.
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you can only get a cherish ball from Nintendo event
you can only get cherish balls on event Pokemon they are not obtainable
Any event Pokemon like Darkrai and Arceus will be in a cherish ball. Otherwise, you have to hack for it. Yeah and also cherish balls have the same catch rate as a poke ball. Basically you have to hack. event Pokemon are in cherish balls, but don't hlold them. btw, theyr'e kinda pointless. at least they look cool though. they have an awesome opening burst.
Nothing's better than a masterball. it catches any Pokemon without any miss. it's impossible to not catch a Pokemon with the MB. and by the way, what IS a cherish ball?
it cherishes the Pokemon you catch=D. i think