Tirtouga

Tirtouga (Japanese: プロトーガ Purotooga) is a Generation V Water/Rock-type Fossil Pokémon. Tirtouga can be revived from the Cover Fossil.

https://vignette.wikia.nocookie.net/pokemon/images/1/1a/564Tirtouga.png/revision/latest?cb=20140329050710

Biology
Tirtouga is a reptilian Pokémon resembling a baby leatherback sea turtle. Its body is blue with black spots on the edges of its flippers. Its black shell has six circular indentations in it. It has a black upper beak and a mask that covers most of its head. It has a light blue patch underneath its eyes.

Tirtouga's shell is very tough, and it can dive down to depths of as much as 1,000 meters. Tirtouga was known to actively hunt for prey to the extent that it would go on land to reach them. Tirtouga lived in the oceans long ago and is now extant only by reviving it from fossils. The people of Alola believe it to be an ancestor of most turtle Pokémon.

Major appearances
Tirtouga made its main series debut in ''A Restoration Confrontation! Part 1'', where it was befriended by Ferris in the past. The same Tirtouga appeared in the follow-up episode, where it managed to evolve into Carracosta.

Minor appearances
Multiple Tirtouga debuted in White—Victini and Zekrom and Black—Victini and Reshiram.

In the Pocket Monsters BW: Good Partners manga
Two Tirtouga appeared in BWGP05.

In the Pokémon Adventures manga
Marshal owned a Tirtouga sometime before arriving in Nimbasa City. Because of his uncontrollable nature, he released him the day before meeting Black and White. He was later caught by Black and nicknamed Costa. Under Black's ownership, he eventually evolved. He first appeared in Growing Pains.

A Trainer's Tirtouga appeared in PS548.

Trivia

 * Tirtouga and its evolved form are the only Fossil Pokémon to have Rock as their secondary type.
 * Tirtouga has a striking resemblance to a Pokémon-like design which appeared in the April 1997 issue of MicroGroup Game Review.

Origin
Tirtouga appears to be based on a baby sea turtle, more specifically, a leatherback. It also may be based on Ancylotherium, a large, prehistoric sea turtle that was smaller than the Ancylotherium that Carracosta may be based on.

Name origin
Tirtouga may be a corruption of tortuga (Spanish for turtle, tir having a similar phonetic pronunciation to the tur in turtle) or derived from Tortuga (translated as Turtle Island in French and Spanish). It may also be a corruption of tartaruga, Italian and Portuguese for tortoise, seeing as turtles are closely related to tortoises.

Protoga may be a combination of Protostega (an extinct turtle species largest second to only the Archelon, which its evolution is based on) and tortuga.