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**Best Ball catch rate in RBY**

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**Drake|Seawood****Member**- From: Cerulean City
- Registered: 2014-03-06
- Post 27/27
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Long time ago I've read on Bulbapedia about how Pokeballs catch rates works in RBY and so I've been brainstorming about what's the best type of ball overall, I mean, at any situation.

Besides Master Ball, the info says Poke Ball generates a random number between 0-255, Great Ball 0-200 and Ultra Ball/Safari Ball 0-150. This means that Poke Ball is the best option since it generates more random numbers?

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**Rocket Grunt****Member**- Registered: 2014-12-27
- Post 72/75

That depends on the situation. If the Pokemon has status ailments, then a PokeBall provides the greatest chance of capture.

But look at this:

`f = (HPmax * 255 * 4) / (HPcurrent * Ball)`

given that Ball = 8 for Great Ball or 12 otherwise, and given that

If f is greater than or equal to M, the Pokémon is caught.

Since we need to have f>=N (where N is a randomly generated number which is between 0 and 255 for PokeBall etc.), the number generated should be lower to secure a greater chance of capture, therefore Ultra Ball is the best and Poke Ball is the worst.

But consider the variable Ball, since exclusively, the value of Great Ball is 8 (and Ultra Ball is 12). Great Ball can be even more effective than an Ultra Ball, when a Pokemon has a high catch rate and it's HP is greater than 1/2.

*Last edited by Rocket Grunt (2015-07-31 11:24:35)*

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**Best Ball catch rate in RBY**