Pliosaur, Plesiosaur+Smilodent, Sabertuth

Pliosaur: Their jaws can crush the toughest shells. It is believed they're responsible for Omanyte's extinction.
 
Plesiosaur: Its long neck enables it to reach on the shore for prey. Its quick to strike, some would've find themselves with a bite mark without seeing what caused it.
 
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Smilodent: They are very playful, but anything caught between two cubs may get badly scratched. They will chase anything.
 
Sabertuth: The last of the prehistoric pokemon to stand, it is believed they went extinct due to depression, with their habitat empty of life. They live in families and hate to be alone.