Breeding for a shiny?

Question

if I breed a japanese shiny ditto with a normal tyrunt. how high are my chances of getting a shiny or about how many eggs till a shiny might come.

Answer 1

The Masuda method (Japanese: 国際結婚 international marriage), also known as Masuda's method, is a fan-made term which describes a way to obtain Shiny Pokémon more easily from Generation IV onwards. While the standard encounter rate for a Shiny Pokémon (either in the wild or by breeding) is 1/8192, the Masuda method multiplies this rate by 5 (to 5/8192 or about 1/1638) in Generation IV and by 6 (to 3/4096 or about 1/1365) in Generation V. It occurs whenever Pokémon of differing real-world geographical origin are bred.

As an additional reward for catching every single non-event Pokémon in the National Pokédex, the player can receive the Shiny Charm from Professor Juniper. Having this item in the Bag increases the chance of obtaining a Shiny Pokémon by a flat 2/8192, resulting in a 3/8192 chance (about 1/2731) of finding one normally (an effectively tripled chance) and an 8/8192 chance (1/1024) of hatching one through the Masuda method. (1/512 with Shiny Charm in Gen VI)

-Bulbapedia

Comments

my ditto is shiny doesn't that change anything???

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Nope..

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so about how many eggs

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It varies on what you have and don't. Some get it in 400-1000ish eggs, some get it in 60. Based in luck really.

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*cough* my answer *cough*

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Those are chances, not egg counts.

Answer 2

#1/1024 or 1/512 with the Shiny Charm.

...As of gen 6.
The Ditto being shiny does not affect the shiny rate, only it's nationality does.

in previous generations:

Gen 4 - 1/1638
Gen 5 - 1/1365

Source