Katy Perry has released a new single Electric in celebration of Pokémon's 25 anniversary.
In the video, Katy Perry and her Pikachu reminisce about growing up, where we see flashbacks to a younger Perry and Pikachu as Pichu. The message is that people evolve, just like Pokémon do.
You can watch...
I want to say it's one to one, but in all honesty I'm a bit fuzzy there. I can recommend JoyFreak's sister site AdminIntel - Admin & Webmaster Resource where there are lots for people of varying degrees of expertise with development, you likely can get a far more precise answer there!