Is the Pokemon a different color than normal. If so then you have yourself a shiny Pokemon, which looks like this:
![Shiny Pokemon](/pokebase/qa-plugin/https-img-proxy/image.php?key=dc16ed911aa50157&url=http%3A%2F%2F1.bp.blogspot.com%2F-kvefzrDI6pg%2FUZZgn3IckUI%2FAAAAAAAAAFo%2FM6xHVZ56-7s%2Fs1600%2Fshiny%2Bsanddile.png)
If its not a different color you have two other options. Its either one of N's Pokemon, which sparkle like this:
![N's Purrlion](https://www.serebii.net/black2white2/nspokemon.png)
But if its more of a Star than anything else you have yourself a star in a Pokemon movie though I wouldnt count this as a sparkle, here what it looks like:
![Pokestar Pokemon](https://www.serebii.net/black2white2/pokestarshine.png)