Will holly hills go out with greg heffly in the third movie?

There is no indication or evidence that Holly Hills and Greg Heffley will go out in the third movie, Diary of a Wimpy Kid: Dog Days.

The third movie focuses on Greg's summer adventures and does not feature any romantic storyline between him and Holly.

It's important to remember that the movie adaptations of the books are not always directly aligned with the source material. While Greg and Holly develop a crush on each other in the books, their relationship is not a major focus in the films.