As volibear, Make sure that you go for short burst trades against Volibear when possible. This will keep him at bay, but make sure you trade after his E is down.

Focus on getting your first item component quickly. This will help you get an edge in the lane, especially once you get some Grievous Wounds.

Once you get your Ultimate, you should become more aggressive in this matchup. The point is to take him down frequently so that he can't do much in the lane.

The wave is to be kept on your side of the tower to have a safe adobe from ganks. This will help you scale up till you can actually deal some damage. As volibear, Make sure you opt for short trades against Volibear when possible. This will keep it at hand, but make sure that you trade after its E is down. Focus on getting your first element quickly. This will help you get a edge in the way, especially once you get serious injuries. Once you get your Ultimate, you should become more aggressive in this matchup. The point is to get it down frequently so it can't do much in the way. The wave has to be kept on your side of the tower to have a safe intake of ganks. This will help you increase until you can actually inflict damage.