Rockruff evolves at level 25. Your Rockruffs are at level. 30-35. Don't worry, Rockruff can evolve at any level above 25. Are you playing Moon or Ultra Moon? Rockruff evolves into midnight Lycanroc at nighttime on Moon and UM. In Moon/Ultra Noon, Nighttime depends on the game's time, because it is 12 hours ahead from real time. If you are playing Sun or Ultra Sun, evolve your Rockruff during daytime. Your Rockruff could also be holding an Everstone.