Pokémon Yellow
Pokémon Yellow

Evolution Methods

Master Pokémon Yellow's evolution methods. Learn level-up triggers, item requirements like the Leaf Stone, and unique conditions to evolve your Pokémon and com.

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Evolution Methods

Understanding how your Pokémon evolve is crucial for building a powerful team and completing your Pokédex in Pokémon Yellow. While most Pokémon evolve simply by gaining enough experience and leveling up, several others require specific items or unique conditions. This guide will detail all the evolution methods available to you.

Level-Up Evolution

The most common method of evolution, many Pokémon will evolve automatically once they reach a certain level. There are no special items or conditions required for these evolutions; simply battle, use Exp. Share (if obtained), or feed them Rare Candies until they hit their evolution level. You'll know a Pokémon is about to evolve when it gains a level in battle and the "Oh! [Pokémon Name] is evolving!" message appears.

  • Strategy: To quickly level up Pokémon, consider battling trainers you've missed, revisiting areas with strong wild Pokémon, or using the Vs. Seeker (obtained later in the game) to re-battle trainers. Rare Candies, found scattered throughout Kanto or occasionally dropped by wild Pokémon, can also instantly level up a Pokémon.

Stone Evolution

Certain Pokémon will only evolve when exposed to a specific evolutionary stone. These stones are single-use items, so choose wisely which Pokémon you want to evolve! Once you use a stone on a compatible Pokémon, the evolution is instantaneous.

  • Fire Stone: Evolves Vulpix into Ninetales and Growlithe into Arcanine.
    • Location: Celadon Department Store (4F), Pokémon Mansion (Cinnabar Island).
  • Water Stone: Evolves Poliwhirl into Poliwrath and Eevee into Vaporeon.
    • Location: Celadon Department Store (4F), Seafoam Islands.
  • Thunder Stone: Evolves Pikachu into Raichu and Eevee into Jolteon.
    • Location: Celadon Department Store (4F), Power Plant.
  • Leaf Stone: Evolves Gloom into Vileplume and Weepinbell into Victreebel.
    • Location: Celadon Department Store (4F), Safari Zone.
  • Moon Stone: Evolves Nidorina into Nidoqueen, Nidorino into Nidoking, Clefairy into Clefable, and Jigglypuff into Wigglytuff.
    • Location: Mt. Moon, Celadon City (hidden in the Rocket Game Corner), Pokémon Mansion.

Important Note: Unlike later generations, Pokémon evolved via stones in Yellow will not learn any new moves by leveling up after evolution. Consider teaching them desired moves before evolving them, or rely on TMs/HMs afterward.

Trade Evolution

A select few Pokémon require trading with another player to evolve. This means you'll need access to another Game Boy, a Link Cable, and a friend (or another copy of the game) to complete these evolutions. The Pokémon will evolve immediately upon being traded.

  • Kadabra into Alakazam
  • Machoke into Machamp
  • Graveler into Golem
  • Haunter into Gengar

Walkthrough Steps for Trade Evolution:

  1. Ensure both Game Boys are powered off.
  2. Connect the two Game Boys using a Link Cable.
  3. Power on both Game Boys and load Pokémon Yellow on both.
  4. Navigate to any Pokémon Center in the game.
  5. Go to the second floor and speak to the attendant on the right side of the counter to initiate a "TRADE" session.
  6. Select the Pokémon you wish to trade and have your friend do the same.
  7. Confirm the trade. Once the trade is complete, if the Pokémon is one of the four listed above, it will evolve on the receiving player's Game Boy.
  8. To get your evolved Pokémon back, you'll need to trade it back to your original game.

Alternative (Glitched) Method for Solo Players: For players unable to trade, the infamous "Mew Glitch" (also known as Trainer-Fly) can be exploited to obtain evolved forms like Alakazam, Machamp, Golem, and Gengar without trading. This is an advanced glitch that requires precise steps and manipulation of the game's memory. While not officially supported, it's a known method for completing the Pokédex solo. Consult dedicated glitch guides for detailed instructions on performing the Trainer-Fly glitch for specific Pokémon encounters.

Pikachu's Unique Evolution

Your starter Pikachu in Pokémon Yellow has a unique personality and will refuse to evolve into Raichu when exposed to a Thunder Stone. If you wish to obtain a Raichu for your Pokédex, you must catch a wild Pikachu (found in Viridian Forest or the Power Plant) and then use a Thunder Stone on that specific Pikachu. Your starter Pikachu will remain a Pikachu throughout your adventure, reflecting its bond with Ash from the anime.