Since the announcement of the Ultra Bonus, we know that the first Gen 5 Pokémon will land on the game at the end of September.
Klink, Patrat and Lillipup will therefore be available in the wild and their friends from Unys should not take too long to succeed them.
Anyway, Chrales, the famous dataminer, found a Unys Stone in the game data.
This stone will certainly allow some Gen 5 Pokémon to evolve.