PokéBase - Pokémon Q&A
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Show working please.

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A masterball
Not a master ball, don't have it yet

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Since I'm lazy, I'm going to use Mew as the subject of the question (first Pokemon that popped into my head).
Catch rate of 45, 5.9% chance of catching at full health with a Pokeball.
Ultra Ball increases the catch rate by 2x so the catch rate moves up to 90, and there is a 11.8% chance of catching the Mew at full health (Yes, if catch rate doubles, chance of catching will double, go check something like Bronzong which has 90 catch rate, 11.8% chance of catching).


So given this, we know there is an 11.8% chance of catching the given Mew with an Ultra Ball, or 59/500 as a fraction.

How about not 1, but 6 Pokeballs?
The chance of catching the Mew at least once with the given Pokeballs is equal to;
1 - (chance that you will not catch Mew all 6 times)or 100% - (% you will not catch Mew all 6 times)
So we need to solve the chance that you will not catch Mew all 6 times.
That is equal to (Chance of not catching Mew once)^6
If you don't understand why, don't worry, you'll learn in Probability or Combinations and Permutations later.
Chance of CATCHING Mew = 5.9% or 59/1000
So the chance of NOT CATCHING Mew is 94.1% or 941/1000

So now you want to solve (941/1000)^6
This number is too long for me to be bothered putting in fractional form, so in a rough % form it would be 69.42849331%

100% - 69.42849331% = 30.57150669

There is a 30.57% chance that you will catch the given Mew in those 6 Pokeballs


TL:DR 6 Pokeballs > 1 Ultra Ball.

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Maaaaaath :D