I would say the one on the way to de-activate the generator at new mauville near the cycling rode in Ruby, Sapphire, and Emerald.
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Other than secret bases the best spot is the Pokemon league.
the best pokemon to use is mudkip.
there is no best with lots of love and care your electric Pokemon can be the best there is :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :)
Best non-legendary water pokemon would be Gyarados. Best legendary water pokemon is Kyogre.
Blaziken or Toarkal.