Ya Swarm is the Bug version to the Starter's abilities. I think there is another similar to them but I don't remember it.
Run Away has its in game uses. You don't want to battle, having little health or no quick way to the Pokemon Center and need to get to the next area. Run Away has the same 100% Flee chance as Smoke Ball so you always run away. It saved me a lot in the early games when I was down to my last Pokemon with no healing items and halfway through a dungeon.