Tips: the hardest part on this level is the insufficient number of moves given. Apparently King does not think so. Anyway, while the bears are being moved around when I played this, there most likely one in the left side corner, one in the middle (by the right side), one in almost bottom right side and two in the middle bottom row. Do lots of special candies, especially wrapped + stripe candies so you can hit multiple blocks at a time. Then you also need some luck to have a little cascading effect so this will do the destruction of other blocks for you. Otherwise, this level is tough to do within 18 moves. Good luck.
See this Level 99 walkthrough video (Quicktime needed).
Candy Crush Soda Saga Level 99 walkthrough