From Bulbapedia, the community-driven Pokémon encyclopedia.
Mighty Tyranitar (Japanese: だいちをまもるバンギラス Bangiras, Protector of the Land) is the name of a Pokémon-based e-Reader application. It is a minigame featuring Tyranitar. Five cards are required for the Mighty Tyranitar application: Tyranitar, Pupitar, Kangaskhan, Larvitar, and Onix.
In Mighty Tyranitar, the player takes on the role of a powerful Tyranitar. In the game, a volcano is erupting and it is spewing out lots of rocks. The objective of the game is to destroy all of the rocks with Tyranitar's Hyper Beam attack before the rocks hit the ground. As the game progresses, the rocks begin to fall faster. The game ends when the player misses a rock.