It at the cutters house in Rustboro city(you have to defeat the gym leader Roxanne in Rustboro city to be able to use it).
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If you mean HM01 Cut, you can get it from Cutter Man in Rustboro City. His house is beside the Pokemon Center.
sorry, you can't get riolu in Pokemon emerald version.
At the cutters house in rustburo city next to the Pokemon center HOPE IT HELPED!!!
You get HM01 (cut) in Rustboro City. There'll be a man and a girl in the house the man gives you cut.
You must board the SS Anne ship and help the sick captain in order to obtain HM01.