It's too late to train the Eelektross because it most likely has all it's EVs.
___
Eelektross (M) @ Leftovers
Nature: Careful
Trait: Levitate
EV Spread: 252 HP / 4 Atk / 252 SpD
- Coil (+1 Atk, +1 Def, and +1 Acc)
- Wild Charge (STAB)
- Substitute / Brick Break (Protect yourself while you Coil or coverage)
- Dragon Tail / Dragon Claw (Attack and then remove them from battle or just damage)
OR
Eelektross (M) @ Leftovers
Nature: Modest
Trait: Levitate
EV Spread: 252 HP / 252 SpA / 4 SpD
- Acid Spray (ALWAYS lowers Special Defense by 2 stages.)
- Thunderbolt (STAB)
- Flamethrower (Coverage)
- Grass Knot / HiddenPower Ice (Coverage)
\m/o_o\m/