Pokemon Diamond & Pearl

Fossil Pokemon
Hidden within the walls of the Shinou Underground are a variety of fossils waiting to be discovered and resurrected with the power of science. Unlike previous games, each fossil is exclusive to Diamond or Pearl, to encourage trading.

Above: The fossilized Pokemon found in the Shinou Underground are unique to each game, encouraging trading between Diamond and Pearl

Zugaidosu
This violent, rock-type pachycephalosaur (yep, really!) uses its hard head to deal massive damage to its foes. It has an exclusive new attack, Double Headbutt.

Tatetopusu
Tatetopusu, a hornless triceratops-like Pokemon, uses the wide plate growing over its head to shield it from damage. Defense is its strong suit, which it gets even better at when it evolves, developing a steel covering.