From Bulbapedia, the community-driven Pokémon encyclopedia.
Crystal (Japanese: クリスタル, abbreviated to クリス Crys) is the seventh main character of the manga series Pokémon Special. Thanks to a bad fall she took as a child, breaking her arms, she learned to throw Poké Balls with her feet. She's caught over 200 Pokémon, more than any of the other characters in Pokémon Special. Her "starter" Pokémon was a Chikorita which escaped from Professor Elm's lab, longing to go on a journey. While it is known that she has filled her Pokédex, she later adds Hoenn Pokémon to her collection. These are used by Emerald when he goes to the Battle Frontier.
All of Crystal's party Pokémon have a symbol of a star somewhere on them. Some wear star necklaces or stickers, but her Cubone and Parasect naturally had markings in the shape of stars.
Crystal's special skill, as described by Professor Oak, is Pokémon catching.
Netkun on Crys