This is Elani. See that necklace that she wears? That's a necklace that was cursed by a Sableye to show the wearers "true colors", or their aura.

Elani has black because of her overall mysterious demeanor.

The purple is from her fearful nature.

Light pink represents her sweet side.

And light blue is her sensitivity to rude remarks.

She is actually just a shiny Ampharos without her necklace, but it was given to her as a gift, so she wears it sometimes, although she isn't too fond of its color changing properties.