Eelektross is the only Pokemon of all that has no weaknesses making him a really strong Pokemon. Here is my moveset for my op eelektross.
Ability: Levitate as usual
Ev's: 4 Hp, 252 Defence, 252 Special Attack
Rain Dance - Making sure that thunder hits every time.
Thunder - Has high base power, STAB, Power becomes higher because of magnet, and hits every time due to rain dance.
Grass Knot - Does high damage to ground types, which are usually heavy.
Volt Switch / U-turn - Good for switching out. I suggest U-turn for type coverage.