Get rid of charge and toxic, they don't help with his low defense.
As Menectric is 1 of my favs, ive trained many over the years. This is the moveset I found best:
Thunderbolt(STAB, higher Special attack)
Hidden Power(if you can find an water or grass one to cover the ground weakness)If not grass or water hidden power, Charge Beam can be helpful, to lower the opponets special attack, and reflect will work here too.
Flamethrower(same reason as you)
The Last slot is for whatever the heck you want. I put Iron Tail as my Main Manectric has pretty good attack. But if you wnt toxic or charge, though I don't like them, you can add them in here.