The Defending Pokémon can't retreat during your opponent's next turn. If the Defending Pokémon tries to attack during your opponent's next turn, your opponent flips a coin. If tails, that attack does nothing. (Benching either Pokémon ends this effect.)
It has 49[sic] teeth in its mouth that are constantly replacing themselves. Pull one out, and a new one grows in.
キバはぬけても、次から次に生えてくる。いつも口の中には48本のキバがそろっている。
Trivia
The English Pokédex entry for this card erroneously states that Croconaw has 49 teeth instead of the correct 48. The same error occurs in the French, German, and Italian prints of this card.
Origin
This card's Pokédex entry comes from Pokémon Gold, though it is heavily reworded in English.