I think it OK with the way it is now (Events, DW/DR, and Hidden Grotto), but then again I was also partly sadden when I herd that TM's can be used multiple times from gen.4 to 5. The value of TM's became nothing and every one was using Earth Quake.
That little bit aside. Maybe you can receive a rare item after completing the regional Pokedex (like the egg charm). Then give that item to one of the Pokemon in a daycare for a chance of having a breeded Pokemon with it's hidden ability (like the everstone before B2/W2).
Its an easier method, yet you still have to work hard for it. --- My 3DS FC: Is a secret to everybody... Twitter @DJ_star_knight
Even if I have to pay ludicrous amounts of money to change my Pokemon's abilities to Hidden Abilities, I would love it. *looks at Blaziken and Lugia* I'd love it a lot... --- https://i.chzbgr.com/completestore/12/8/11/wXLYp87DiE2C6xnGXLS7BA2.jpg