Do you have to cook chicken before you put it in the slow cooker?

I want to make some pulled BBQ chicken today for sandwiches using the slow cooker. My boyfriend keeps telling me I have to cook it on a skillet before I put it in the slow cooker...but I thought the slow cooker COOKS the chicken? I have 3 chicken breasts and I'll be using a BBQ sauce we like. Also, does anyone... show more I want to make some pulled BBQ chicken today for sandwiches using the slow cooker. My boyfriend keeps telling me I have to cook it on a skillet before I put it in the slow cooker...but I thought the slow cooker COOKS the chicken? I have 3 chicken breasts and I'll be using a BBQ sauce we like. Also, does anyone have any tips for using the slow cooker? Thanks!!
Update: I plan on putting it on low for like 5 hours...
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