>>28885548>>28885857252+ Atk Machamp Heavy Slam (120 BP) vs. 252 HP / 252+ Def Sylveon: 272-320 (69 - 81.2%)
252+ Atk Machamp Heavy Slam (120 BP) vs. 252 HP / 252+ Def Florges: 262-310 (72.7 - 86.1%)
252+ Atk Machamp Heavy Slam (80 BP) vs. 248 HP / 252+ Def Clefable: 170-200 (43.2 - 50.8%)
Should outspeed all the generally slow tanks and bulky mons, with 168 Speed EVs Florges too. But needs way less for base 60 Clefable and Sylveon. Close Combat is acceptable too for the sheer power.
Also activated Guts damage:
252+ Atk Guts Machamp Heavy Slam (120 BP) vs. 252 HP / 252+ Def Sylveon: 406-478 (103 - 121.3%)
252+ Atk Guts Machamp Heavy Slam (120 BP) vs. 252 HP / 252+ Def Florges: 394-464 (109.4 - 128.8%)
252+ Atk Guts Machamp Heavy Slam (80 BP) vs. 248 HP / 252+ Def Clefable: 252-298 (64.1 - 75.8%)
It was eventually accepted by Smogon too.