An old gimmick set from gen IV,
Shuckle@Leftovers
Impish/Gluttony
252Atk/252HP/4SpDef
-Acupressure
-Rock Slide
-Rest
-Power Trick
Worked really well in NU, and even had some success in OU. Once you have +6 attack and defence changing them doesn't make you frail and with +6 evasion...