Bittacuda

The  Bittacuda  is an enemy in  Super Paper Mario. It appears only in Chapter 3-2, in the  Tile Pool. The Bittacuda is a carnivorous orange fish, slightly bigger than  Bowser. Its name is a portmanteau of "bit" and "barracuda," though they do not in any way resemble their  namesake fish. It is one of the few enemies in the game that can attack even when Mario flips to 3D. The Bittacuda will swim toward Mario when it spots him, but it will eventually give up chase. When  Big Blooper  appears, all the nearby Bittacudas flee, which may suggest that Bittacudas are afraid of creatures who are bigger than them.

Tattle
That fish is a Bittacuda. It's a carnivorus beast with vicelike jaws... Max HP is 10 and Attack is 2. It will try to eat anything that swims buy... If you insist on fighting this fish, I would suggest flipping dimensions... I do hear these voracious beasts are quite tasty...

Catch Card Location
Brought from The Card Shop or used a Catch Card or Catch Card SP