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Dunkleosteus would be amazing. A 10 meter giant armoured fish, with insanely powerful jaws.
"This mechanism allowed D. terrelli to both achieve a high speed of jaw opening, opening their jaws in 20 milliseconds and completing the whole process in 50–60 milliseconds, comparable to modern fishes that use suction feeding to assist in prey capture, and produce high bite forces when closing the jaw, estimated at 6,000 N (1,350 lbf) at the tip and 7,400 N (1,660 lbf) at the blade edge in the largest individuals."
Possibly Strong Jaw, Shell Armour/other armour abilities. Also an ability that increased priority of biting moves, or a biting move that has priority.
It'd have high atk and def, not to sure on the rest of the stats.