Crystal is an expert in capturing Pokémon, a skill she developed when she was young. After an accident during her childhood that left her arms broken, Crystal learned to kick Poké Balls with her feet. Although by now her arms have been completely healed, Crystal has retained the habit of kicking her Poké Balls instead of throwing them. Crystal is very dedicated to her task of completing the Pokédex and has faith in her Pokémon and their ability to help her. Though she can be insecure about herself when she fails, with encouragement she is able to pick herself back up and restore her confidence in herself.

Spoiler

For her skills, Dr. Yukinari Okido gave Crystal the title of "Catcher".

(Source: Bulbapedia)