Since you seem to like attack-boosting items, you might consider giving your Electrode the Magnet item, which will boost the power of its Thunder attack. Here's a quick reference of all the attack-boosting items, in case you weren't aware of some of them:
ITEM: Black Belt
TYPE: Fighting
FOUND: Behind Lake of Rage on Wednesday
ITEM: BlackGlasses
TYPE: Dark
FOUND: In Dark Cave, from Route 45 entrance
ITEM: Charcoal
TYPE: Fire
FOUND: In Azalea Pokémart (get one free from Charcoal Man's apprentice)
ITEM: Dragon Fang
TYPE: Dragon
FOUND: In Dragon's Den
ITEM: Hard Stone
TYPE: Rock
FOUND: On Route 36 on Thursday
ITEM: Magnet
TYPE: Electric
FOUND: On Route 37 on Sunday
ITEM: Metal Coat
TYPE: Steel
FOUND: On S.S. Aqua, and in the possession of wild Magnemite (use TM46 Thief)
ITEM: Miracle Seed
TYPE: Grass
FOUND: On Route 32
ITEM: Mystic Water
TYPE: Water
FOUND: In Cherrygrove (need Surf)
ITEM: NeverMeltIce
TYPE: Ice
FOUND: In Ice Path
ITEM: Pink Bow
TYPE: Normal
FOUND: In Route 29 on Tuesday, and in Goldenrod Radio Tower
ITEM: Poison Barb
TYPE: Poison
FOUND: In Route 32 on Friday
ITEM: Sharp Beak
TYPE: Flying
FOUND: On Route 40 on Monday
ITEM: SilverPowder
TYPE: Bug
FOUND: In the possession of wild Butterfree (use TM46 Thief)
ITEM: Soft Sand
TYPE: Ground
FOUND: On Route 34 (need Surf)
ITEM: Spell Tag
TYPE: Ghost
FOUND: In Blackthorn on Saturday
ITEM: TwistedSpoon
TYPE: Psychic
FOUND: In the possession of wild Abra (use TM46 Thief)