three pokemon could all be considered the "best", depending upon your definition.
Magneton- high special attack, very resistant to attacks (only ground is super effective)
Issues- lack of electric moves (you should use a tm), only available later in the game
Lanturn- mixed types make it resistant and versatile, good move set
Issues- only available later in the game
Manectric- very high speed, high special attack, good move set
Issues- weak in other terms, does not handle damage well.
Depending upon which of those is more important to you, choose accordingly.
some good electric Pokemon catches in RUBY/SAPPHIRE would be electrode, manectric and magneton (Electrode and Magneton are rare but Manectric is Uncommon) there is also voltorb, pikachu, magnemite, chinchou, lanturn e.t.c
Wattson the electric gym.
well i have ruby and sapphire and slugma is in that cave near the electric city
The best electric Pokemon is Luxray Lv.100
the best Pokemon to use against electric Pokemon is ground/rock Pokemon.
some good electric Pokemon catches in RUBY/SAPPHIRE would be electrode, manectric and magneton (Electrode and Magneton are rare but Manectric is Uncommon) there is also voltorb, pikachu, magnemite, chinchou, lanturn e.t.c
Mauville
He uses electric Pokemon. His Pokemon differ between "ruby and sapphire" and "emerald".
Electrike can
Wattson the electric gym.
Aggron and Rhydon are definitely the best Pokemon on Pokemon Ruby! Their big, strong and both are great and they're awesome!
well i have ruby and sapphire and slugma is in that cave near the electric city
Groudon is the best Pokemon in the game that is cachable.
In Pokemon ruby, the first electric gym is wattson's gym, it is the third badge you obtain in the game. A good strategy to beat him is to bring along a ground type, or a fire type since he uses a Pokemon called magneton, which is Electric/Steel.
groudon
cranidos
The best electric Pokemon is Luxray Lv.100