You should usually evolve Pikachu in FireRed right after level 26 , once it has learned Thunderbolt, unless you have a special reason to wait longer.

Quick Scoop

  • Most guides recommend: let Pikachu reach level 26, learn Thunderbolt, then use a Thunder Stone to evolve into Raichu.
  • Evolving earlier gives you stronger stats sooner, but you risk missing key level‑up moves if you don’t have TMs.
  • Raichu does not learn new moves by level‑up in FireRed, so all your planning happens while it is still a Pikachu.

Why level 26 is the sweet spot

  • In FireRed, Pikachu learns Thunderbolt around level 26, which is its main high‑power, high‑accuracy Electric attack for the story playthrough.
  • If you evolve before that and you don’t have the Thunderbolt TM, you can end up stuck with weaker Electric moves for a while.
  • After Pikachu gets Thunderbolt, Raichu gives you a big jump in Attack, Special Attack, and Speed, making battles easier the rest of the game.

Simple “when to evolve” rules

  • If you care about in‑game strength and smooth progression → evolve right after level 26.
  • If you love using level‑up moves and want every option → you can delay to around level 32+ so Pikachu learns more on its own, then evolve when you’re happy with the movepool.
  • If you just like Raichu and don’t mind using TMs → evolve as soon as Pikachu knows a good Electric move that you’re comfortable keeping for a long time.

Different player viewpoints

Here’s how common opinions from forums and guides break down.

[5][1] [9][5] [3][7] [9]
Play style Suggested time to evolve Reasoning
Casual story player After level 26 Get Thunderbolt first, then enjoy Raichu’s higher stats for an easier playthrough.
Min-max / planner Level 26–32+ Keep Pikachu until you’ve picked up all the level-up moves you want, then evolve when the movepool is “finished”.
Early power fan As soon as you have a decent Electric move + Thunder Stone Prioritizes immediate stats and doesn’t worry much about missing a few level-up moves.
Nostalgic / role-play Very late or never Keeps Pikachu unevolved for personal preference or “Ash style”, sacrificing some raw power.

Example in a real run

Imagine your Pikachu hits level 26 right before a tough Gym.
You let it learn Thunderbolt, then use a Thunder Stone: suddenly Raichu is outspeeding most enemy PokĂ©mon and one‑shotting many with that same move, while you no longer worry about future level‑up moves because Raichu won’t get any new ones that way in FireRed.

Bottom line: in PokĂ©mon FireRed, “when should I evolve Pikachu” is usually answered with “after level 26, whenever you’re happy with its moves and ready for Raichu’s power boost.”

TL;DR:
For PokĂ©mon FireRed, the most commonly recommended answer to “when should I evolve Pikachu Fire Red” is: let it reach level 26, learn Thunderbolt, then evolve to Raichu with a Thunder Stone for a strong, smooth in‑game experience.

Information gathered from public forums or data available on the internet and portrayed here.