juggling is when you have two paths, one blocked off and one not. when the enemies are close to the end of one path, unblock the blocked path and block the end of the path they are on, forcing them to go back and to take the other path.
the name doesn't really fit... should have gone with "the Revenge of the Green Topped Pokeball as It Tries Multiple Times To Do The Exact Same Thing On Slightly Different Levels But Somehow Explodes When It Fails..."