Quoted By:
I'll start with a less known:
>in Gen V Basculin has four Abilities: 2 shared by both forms and 2 exclusives to each form
>Reckless is exclusive to Red while Rock Head is exclusive to Blue
>no matter how many Blue Basculin you encounter in the wild in BW1 they'll never have Rock Head as Ability, instead they'll have Reckless, making an in-game trade the only way to get Blue Rock Head
>in B2W2 it was "fixed" by making they have the correct Ability when it is found in the wild, but in both BW and B2W2 when hatched from and Egg Basculin will never have Rock Head as Ability no matter the form
At least it was fixed in Gen VI.