Changing Nidorino's Cry in the FR opening

[Esarty]

Title says it all, I'm changing the sprites in the Fire Red intro but I don't know how to redirect which cry the opening pulls for the video. Anything related to it that I look up involves changing the cry audio entirely, which is not what I want to do (I'd rather the nidorino ingame still sound the same). So any help is appreciated.
Edit: I'm still pretty unexperienced, so don't expect me to understand more than the basic stuff of editing.