[polka-dot-jewel]

Err...no. lol Crystal Kay is popular in Japan. Ayu is also pretty popular, she doesn't need to sing the theme for a Pokemon movie to "become more popular".

Also, they haven't released Pokemon movie soundtracks over here in the States since the third movie. (You can buy imported soundtracks via the store shipping it to you, or you buying it online.) Plus, they always re-do themes for the US-releases (with the exception of the sixth movie, where they half re-did it), so there's a good chance her version may not even be heard over here.

Plus, Pokemon movie themes never seem to sell well in Japan anymore. It's other anime themes, like BLEACH, that seem to sell more.