>>13885917Coming from personal experience, Adamant isn't a good nature for Eelektross. It's best natures tend to be Modest, Brave, Sassy or Quiet and Eelektross tends to excel as a mixed offensive tank with more emphasis on the special.
With all that said Adamant only gives you two options, if it's for singles Coil/Drain Punch/Thunder Punch/Aqua Tail or Dragon Tail with a HP228, Atk86, S.Def196 spread. Or use it as a Doubles/VGC Trick Room offense with Acrobatics/Drain Punch/Wild Charge/Protect and a Flying Gem with a full Attack spread.