A Lass is a Trainer Class introduced in Generation I. They are young girls wearing miniskirts and are one of the oldest in-use classes. They use Pokémon found early in gameplay and can also be found early in the game. Most Lasses use -type Pokémon in battle. In Generation III, a pair of Lasses is put together to form Sr. and Jr. Lasses, one of whom, the elder, is the younger's mentor.
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- They are one of the most common trainer classes in all the regions.
- They are the female counterpart to Youngsters.