As a child, she had a bad fall resulting in her arms breaking, and learned how to kick Poké Balls with her feet to capture a Pokémon, which has become her habit even after her arms mended. Also, she gets often called "Super Serious Gal" by Gold, which represents her serious nature. Next to that, she's brave and does everything to help others, which is shown when she stops working at the kindergarten (which looked terrible), to help Oak with his research by completing the Poké dex. Crystal then uses the money she gets to repair the building at the kindergarten, making everyone cry since she had always been kind and caring.
Crystal's special skill, as described by Professor Oak, is capturing Pokémon. To this extent, Crystal is referred to as 'The Capturer'. Due breaking her arms when she was a child, she taught herself to capture Pokémon by using her legs/feet. She has always been training on Mt. Mortar, and seems to be quite smart.
She has been shown to be good at catching Pokémon as she helps Professor Oak in the lab to study, and is mentioned to have captured all non-legendary Pokémon for Professor Oak to study. She later starts to work full-time as one of Oak's assistants.
Crystal prefers to use only a select team of Pokémon, so she usually catches Pokémon for others, such as Prof. Oak. She can only afford to take strong Pokémon with her on her journey, so she is very selective on which Pokémon she takes on her team. All of the Pokémon from her team have a star somewhere on their body, so as to not confuse them with wild Pokémon of the same species. She has caught at least one of every Pokémon in the Kanto and Johto regions (except for the Legendary Pokémon) for Prof. Oak, but only 26 of those Pokémon have ever been seen or mentioned.
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Crystal's Mr Mime, is the newest Pokémon on her team and as such, not much is known about it, except that it can create barriers like Sabrina's Mr. Mime. It is at level 44 and has a star sticker on its chest.