Neither can Marowak? Koko U-turns out, Clefable Knocks Off, Magearna outspeeds does over 50% with Fleur Cannon (let alone a Z move), Dugtrio Pursuits.
If the stall really is that weak to Marowak, the Dugtrio is expected to have Pursuit, which OHKOes after SR unless you win the 50/50. Zard-X...