This Pokemon is Fire/Dragon type with the Shell Armour ability. It has a new move called Shell Trap. This move sets a trap at the beginning of a turn, if Turtonator is then hit by a physical attack in the same turn. It will cause an explosion that deals greater damage to the opponent.
The official site states
'Because Turonator lives on volcanoes, feeding on sulfur and other materials found near volcanic craters, its shell has a layer of explosive material - mostly sulfur. When something strikes this Pokemon, sparks fly from the horns on its shell, igniting an explosion!
In areas around volcanic craters, this Pokemon camouflages itself as a rock and waits for prey. At the moment when its prey steps onto the back of its shell, Turtonator strikes its shell with its own tail, triggering an explosion!
The explosive blasts triggered from Turtonator's back are released through an orifice located on the middle front of the Pokemon's body. This is Turonator's weak point. Attacks landing on its stomach will cause it a great deal of damage.