What is the characteristic of Rattat's teeth?

Сonstantly growing
Contain diamonds
May be invisible

Info: Rattata’s teeth are constantly growing, so the pokemon gnaws on something solid all the time.

About this trivia

Pokemon is a series of games developed and released by Game Freak. The first game was released in 1996, after which the following parts come out almost every year. Most games are made in the JRPG genre. In every game there are pokemons - creatures that people catch, tame and train for fighting. Basically, players get the role of a pokemon trainer. The goal of the games is to collect all available pokemons. An interesting feature is the pairwise release of games, because of which players have to communicate with the players of the paired game. This Trivia contains 10 questions of varying difficulty on a series of games Pokemon