http://www.geocities.com/xactcreations/IVProbs.html.Actually, the Female is not Impish, it's Rash.
I'm getting a little confused here, so I have a Non-Impish Ditto with 31Def, the 31Atk + 30-31SpD Female Gligar that is Rash... how do I achieve:
Impish Gligar
x/31/31/x/31/x
i went here and it said 1 in 138 eggs you should get the ivs you want assumeing parents pass ivs w/o everstone and 1/138 is multiplayed by 1/20 ( 20 random natures) will give you:
1/2760 eggs will result in a Impish Gligar x/31/31/x/31/x
which is .0362% chance of getting it
....well there may be another route or not but this is what i got