Well, they rarely share habitats, so in the wild, I unfortunately can’t say. However, I also admit that hoothoot and rowlet would consider one another competitors for resources, so I doubt they would.
On the other hand, in captivity, they get along quite well, as their needs often overlap, allowing them to be housed, fed, and engaged with equally. Additionally, both pokémon fill different niches on a team, allowing the two to interact and work together in harmony.
So in short, I suppose in scenarios where resources are abundant, I think they would indeed get along quite well, but in an average forest with limited resources, the possibility of the two getting along would unfortunately be quite grim.
The Pokédex According to Bill 