Does Master Ball have a really small percentage of failure?

I have see some questions and some people say thatMaster Ballhave achance of failure.I need someone that can really100% prove itif it can fail.

If it fails, what are the chances of happening?

Pleaselog inorregisterto add a comment.

The Master Ball CANNOT fail within the current parameters in the latest games. If you read the Catch rate article, the variable ‘a’ would equal 255 with maximum HP, no status condition, and the Master Ball, the “worst case scenario” when using it ((3xHPmax - 2xHPmax)31 * 255 / 3xHPmax). Since the probability of catching a Pokemon is 1 if a equals 255, it will always work.

Bulbapedia talk ^Also read Mew’s answerhere. He did the maths which I cbf to do since it’s already been done.Mew did the calculations for the modified catch rate “a” which always ended up at 255, meaning it would be caught every time.

Some sites say it can, but Master Ball cannot fail, as it completely bypasses the mechanics that determine wether the Pokemon is caught or not, as stated by Bulbapedia:

Poké Balls that guarantee capture (the Master Ball and Park Ball, and any ball used in the Entree Forest)bypass the catching formula entirely.

Sourcealso, it was asked beforehere.