How do you get the HM04 in Pokemon Emerald?

CUT: House next to Pokemon center in rustboro

FLASH: Talk to the hiker in granite cave near dewford

ROCK SMASH: House to the right of the Pokemon mart in mauville

STRENGTH: Smash the rock for the dude in rusturf tunnel

SURF: Beat your dad at petalburg gym and wallys dad will give you surf

FLY: Beat your rival at the route near the weather institute (clear inst. first)

DIVE: Beat tate and liza at the mossdeep gym, clear team magma at the space center, and go to steven's house

WATERFALL: Wake up rayquaza and stop kyogre and groudon from fighting, and Wallace will give you waterfall

couldn't have said it better my self

or just use a cheating device