How does Nintendo create another successful Lucario?

Lucario has a 12.5% chance of being female, so if you have a harem of 35 Lucarios there's a 99% chance at least one of them will be female.

You mean GameFreak, right? Nintendo has very little input on Pokemon.
Anyway, they generally have with each generation. Braixen, for example.

So Latias/Latios and Tyranitar?

>34 male lucarios

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