's Cyradia, to hide and conceal her identity and thus once she was old enough to learn how to transform, she decided to mimic Cyra and take the form of a large feline Pokémon.
She initially started with Litleo, which she maintained until she'd grown enough that a regular Litleo would have evolved into Pyroar. Now, she regularly takes the form of a Pyroar and uses that as her 'default' form.