This is a tool to help you breed pokemon of your desired IVs, natures, abilities, etc. All the statistics are based on the Gen 6 games. This tool requires Javascript. You can find the source on Github.
Fill out the information above and click "Calculate" to get the probability for your desired pokémon!
This is a tool to help you determine the probability of getting the pokémon you want when breeding. You can fill out as much or as little as you like. If you're only interested in one section, you can safely ignore the rest. For more info on breeding, Bulbapedia has a lovely article.
In Gen 6, the pokémon you breed will inherit 3 IVs from their parents, at least. If one parent holds a Destiny Knot, the egg will inherit 5 IVs. If one parent holds a Power Item, the egg will definitely inherit that stat from that parent. If both parents hold power items, the egg inherits one IV or the other, but never both. There's no way to guarantee that 6th perfect IV... but if you have two parents with many perfect IVs and you hatch a lot of eggs, you can get lucky!
There are two ways you can make it more likely you'll hatch a shiny pokémon: if you breed pokémon from two different regions (for example, SPA and KOR) or if you have a shiny charm from completing the national pokédex. Together, they make a shiny hatch a lot more likely, but the chance is still only 1 in 512.
If one of your parents has the nature you want, you can give them an Everstone to guarantee they pass it on. Otherwise, it's a toss-up between every possible nature.
If your primary parent pokémon has that ability, they have a 60% chance of passing it on to their eggs. Eggs also have a chance of hatching with any of the pokémon's regular abilities. If you want to breed for a hidden ability, the primary parent must have the hidden ability, or your eggs will never have it.
There's no way to influence what gender an egg will hatch, but it's worth noting that the gender ratio is different for every species of pokémon. Starter pokémon, for example, will almost always hatch male (87.5%). You can look up the gender ratio for many pokémon.
This calculator was made by Alfalfa Scout in HTML and Javascript. Their comments:
I got a lot of inspiration (but no actual code) from destinyknot.tk. Interestingly, the numbers I get for IV calculations are different from the ones given by destinyknot.tk. Whose is right? To be honest, I have no clue. We could both be wrong. If you'd like to help, you can check out the code on Github.