Yes Gen 5 Pokemon have Overworld Sprites. You can see various ones when you entered houses and during various events like Zorua's Event, Zoroark's Event, Volcarona's Event, there are Zen Mode Darmanitan in the Desert, Munna and Musharna appear in the very beginning of the game, Munna is given back to Bianca in Castelia, not to mention the Legendaries.