i played Cham EX at MW regs.
Cham works best with a form of backup, sometimes cham is not good enough alone.
Mine used Cham , Grumpig and Magneton
I ran
3 Meditite
3 Cham EX
2 Spoink
2 Pig
2 Magnemite
2 MAgneton (One that gets energy). Its usually a OHKO vs ludicargo
3...