You should usually evolve Pikachu into Raichu in FireRed right after it learns Thunderbolt around level 26 , unless you have a special reason to keep it unevolved longer.

Quick Scoop

In PokĂ©mon FireRed, Pikachu evolves with a Thunder Stone, not by level, so the “when” is all about move timing and your playstyle. Most players hold off until Pikachu has learned its key Electric move, Thunderbolt, then immediately evolve for a big stat boost.

Best Level To Evolve Pikachu in FireRed

  • A common recommendation is to evolve Pikachu at level 26 , right after it learns Thunderbolt.
  • If you evolve earlier, Pikachu may miss learning some level‑up moves and you’ll need TMs to cover them.
  • Raichu doesn’t really learn moves by leveling in FireRed, so you want Pikachu to grab its important moves first.

Think of it as: let Pikachu learn its “signature tricks” (like Thunderbolt), then evolve it and ride the stat boost for the rest of the game.

Why Not Evolve Immediately?

  • Move learning: Pikachu learns strong Electric attacks like Thunderbolt by level, while Raichu depends more on TMs.
  • TM management: If you try to evolve too early, you might have to “waste” a TM to get a good Electric move, which can be painful in older games.
  • Flexibility: Keeping Pikachu a bit longer lets you decide on its full moveset before locking in Raichu.

Some older forum answers suggest waiting much longer (even level 45–55) so Pikachu can learn more naturally. That’s more of a purist/min‑TM style and less necessary if you’re happy to use TMs.

Different Playstyles, Different Answers

Here’s how the timing changes based on the way you like to play:

  • Casual story play / in-game run:
    • Evolve around level 26 after Pikachu learns Thunderbolt to balance moves and power.
  • Min‑max / move-collector:
    • Keep Pikachu longer to learn more level‑up moves, then evolve once you’ve grabbed everything you care about.
  • Early power rush:
    • You can evolve as soon as you get a Thunder Stone in Celadon for fast stats, but you’ll rely heavily on TMs for a good Electric move.

Practical Example

  • Train Pikachu until it’s about to learn Thunderbolt (around level 26 in FireRed).
  • Let it learn Thunderbolt as its main Electric STAB.
  • Use a Thunder Stone from Celadon Department Store to evolve it into Raichu right after.

At that point you keep Pikachu’s best core move and gain Raichu’s much better stats for the rest of Kanto.

TL;DR: For Pokémon FireRed, the sweet spot most trainers use is: learn Thunderbolt on Pikachu, then evolve to Raichu at about level 26.

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