You grab your egg and put it in your party.Then go to FALLARBOR TOWN and go to the ash filled grass and walk through till you get stopped by a Slugma catch and put him (or her)in your party around your egg and ride your MACH bike till it hatches it works better because the flamebody from the Slugmas incubate the egg (or eggs)and you get more steps in from the Mach Bike :D =0.