Effect

Evolves an Eelektrik into Eelektross, an Eevee into Jolteon, or a Pikachu into Raichu.

Where to find it

In each game: where the item shows up once (on the ground, as a gift, as a reward) and where you can always get it (shops, wild Pokémon holding it, prizes).

  1. Red / Blue · Yellow

    Always
    • Celadon Department Store

  2. Gold / Silver · Crystal

    Once
    • Sea Cottage (from Bill's grandfather)
    Always
    • Route 38 (gift from Lass Dana) (C), Mystery Gift

  3. Ruby / Sapphire · Emerald

    Once
    • New Mauville
    Always
    • Route 124 (trade for Yellow Shard with Treasure Hunter)

  4. FireRed / LeafGreen

    Once
    • Power Plant (×2)
    Always
    • Celadon Department Store

  5. Colosseum

    Always
    • Trade

  6. XD: Gale of Darkness

    Once
    • Gateon Port
    Always
    • Trade

  7. Diamond / Pearl · Platinum

    Once
    • Solaceon Ruins (Pt), Sunyshore City, Route 229 (Pt)
    Always
    • Underground

  8. HeartGold / SoulSilver

    Once
    • Sea Cottage (from Bill's grandfather)
    Always
    • Route 38 (gift from Lass Dana), Bug-Catching Contest first prize (post-National Pokédex), Pokéathlon Dome (2500 Pts.)[We][Th][Sa]

  9. Black / White

    Once
    • Chargestone Cave, Shopping Mall Nine
    Always
    • Dust clouds, Black City (B)/White Forest (W) (Ken)

  10. Black 2 / White 2

    Once
    • Nimbasa City, Chargestone Cave
    Always
    • Battle Subway/Pokémon World Tournament (3 BP), Join Avenue (Antique Shop), Black City (Store 1), Funfest Missions
    • Dust clouds (Chargestone Cave, Mistralton Cave, Clay Tunnel, Twist Mountain, Underground Ruins, Victory Road, Wellspring Cave, Seaside Cave, Giant Chasm)
    • Hidden Grottoes (Routes 2, 3, 5, 6, 7, 9, 13, 18, 22, and 23; Floccesy Ranch; Giant Chasm; Abundant Shrine; Lostlorn Forest; Pinwheel Forest)
    • Transfer from Dream Radar

  11. X / Y

    Once
    • Routes 10 and 11
    Always
    • Secret Super Training (Follow Those Fleeing Goals!, The Battle for the Best: Version X! (X), and The Battle for the Best: Version Y! (Y)), Route 18 (from Psychic Inver)
    • Spiky rocks

  12. Omega Ruby / Alpha Sapphire

    Once
    • New Mauville
    Always
    • Route 124 (trade for Yellow Shard with Treasure Hunter), Mauville City (Inverse Battle Stop), Secret Super Training (Follow Those Fleeing Goals!, The Battle for the Best!), Route 117 (rematch with Triathlete Dylan), Route 118 (rematch with Guitarist Dalton), Secret Base ("Pick up stones" with Secret Pal)

  13. Sun / Moon

    Once
    • Route 8
    Always
    • Konikoni City, Poké Pelago (Isle Aphun - Brilliant-Stone Hunting, Interesting-Item Hunting)

  14. Ultra Sun / Ultra Moon

    Once
    • Route 9, Paniola Ranch (USUM), Ultra Plant (×6)
    Always
    • Konikoni City, Poké Pelago (Isle Aphun - Brilliant-Stone Hunting, Interesting-Item Hunting)

  15. Let's Go Pikachu / Eevee

    Once
    • Route 10, Power Plant
    Always
    • Celadon Department Store
    • Found by Rock-type walking Pokémon (Rock Tunnel)

  16. Sword / Shield

    Once
    • North Lake Miloch
    Always
    • Hidden recurring item (Lake of Outrage)
    • Bridge Field (Digging Duo)
    • Poké Job reward (Tiers V, VI, and IX)

  17. Crown Tundra

    Always
    • Hidden recurring item (Three-Point Pass)
    • Max Raid Battles (Ballimere Lake)

  18. Brilliant Diamond / Shining Pearl

    Once
    • Sunyshore City
    Always
    • Grand Underground

  19. Legends: Arceus

    Always
    • Black ore deposits (Obsidian Fieldlands, Crimson Mirelands, Cobalt Coastlands)
    • Blue ore deposits (Crimson Mirelands, Cobalt Coastlands)
    • Trading post (1,000 MP)
    • Ginkgo Guild cart (randomly sold by Ginter, as "Lightning-Bolt Rock")
    • Space-time distortions

  20. Scarlet / Violet

    Once
    • Levincia, Casseroya Lake, West Province (Area One)
    • Reward for registering 30 Pokémon in the Paldea Pokédex
    Always
    • Delibird Presents (after earning 3 Gym Badges)
    • Tera Raid Battles (1★, 2★, 3★, 4★, 5★)
    • Sparkling overworld item (East Province (Area Three))

  21. Teal Mask

    Once
    • Wistful Fields

  22. Indigo Disk

    Always
    • Item Printer

  23. Legends: Z-A

    Once
    • Bleu Sector 5 (reward for completing Side Mission 053: "The Most Electrifying Eelektrik")
    Always
    • Stone Emporium

Source: Bulbapedia (CC BY-NC-SA)

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