Can I get a HA bunnelby/diggersby in Pokémon y
I f so how
You can get a Bunnelby with its hidden ability by breeding a Diggersby from the Friend Safari. Note that they aren't guaranteed to have their hidden ability, but rather have a chance of it. The chance is 1 in 3 with the Friend Safari.
Source: Bulbapedia + Serebi