When air masses meet. When a moving cold air mass meets a warm air mass, that is lighter, it tends to wedge below the latter, thus giving origin to a cold front. The warm air is forced upwards and its ascent causes the formation of clouds.
Strategies and More Information. Tyranitar is a big Rock/Dark PokÃ©mon, but it is sometimes considered to have Dragon traits, even though it has no Dragon type. Tyranitar comes with the ability Sand Stream which summons a Sandstorm. It generously helps Rock, Ground, and Steel type PokÃ©mon by causing a little damage to other types every turn. It will also boost a Rock type PokÃ©mon's Special Defense one stage (50%).
Tyranitarite This one is found at night and is exclusive to Pokemon X. When you enter Cyllage Gym, go to the right and climb the first wall, then climb the next wall on the right. It is on the ground around the corner.