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one thing to note is that, if breeding for 6 perfect ivs, you'll want to use a breeding pair with the same 5 perfect ivs - each stat can only be inherited from one parent, so this eliminates the possibility of inheriting 2 shit ivs and increases the chance of hatching a perfect pokemon to ~1/192 (1/6 chance of not inheriting the shit iv * 1/32 chance of the generated iv being 31)