The school that you go to will require you to get an intern license from that state. However, the number of intern hours that you have to get "outside" of what the school certifies you for (outside the hours u get thru required rotations) will depend on which state you want to get your license and practice in.
For example, if you go to school in a state that doesn't require any extra intern hours, but you LIVE and plan to work in a state requiring 500 hrs, then u'll need to get that 500 before you are able to sit for licensure for that state.
If you currently live in a state that doesn't require any extra hours, and you do get licensed there, that's fine. However, if you change your mind right after graduation and want to get licensed in a different state, which would require you to do 500 hrs or sthg.. and you didn't get any while you were at school, then u'll need to get that 500 before you can sit for the boards.