Skeetendo

Hey guys, I need your help.
I wanna change da color palette of Pikachu's emotions (you know, when you talk to Pikachu, he responds with animation according to his mood), into a pink color palette.
It's for my rom hack Pokémon Pink.
I was looking through a LOT files of pokeyellow, but I can't find the file that controls that color palette.

¿Me podrían dar una pista de dónde se podría encontrar?
O incluso podrían ayudarme a encontrarlo.
I don't want Clefairy to be yellow.