You should wait to evolve Vulpix in Leaf Green until it’s learned its key moves as Vulpix, then use a Fire Stone to evolve it into Ninetales.

When should I evolve Vulpix in Leaf Green?

In Pokémon Leaf Green, Vulpix does not evolve by level; it only evolves when you use a Fire Stone on it. Because stone evolutions usually stop learning most level‑up moves after evolving, players typically keep Vulpix unevolved until it has learned the fire moves they want, then evolve it.

For classic GBA-era advice (FireRed/LeafGreen), many trainers recommend waiting until Vulpix has learned strong fire attacks like Flamethrower before evolving, so your Ninetales doesn’t miss out on powerful level-up moves. After that point, you can safely use a Fire Stone at any level you like.

Quick scoop (forum-style)

“Vulpix evolves with a Fire Stone, so there’s no fixed level—train it until it learns the moves you want, then evolve.”

Key points:

  • Vulpix evolves only with a Fire Stone , not by level.
  • In older games, evolved stone Pokémon like Ninetales learn very few (or no) moves by level, so evolving too early can lock you out of good moves.
  • A common strategy is:
    • Keep Vulpix until it learns a strong STAB move (like Flamethrower in that game generation).
    • Then evolve with a Fire Stone so Ninetales gets better stats for the rest of the playthrough.

A typical “sweet spot” people mention in guides and forum discussions is to evolve around the level Vulpix finishes its best natural fire‑type move (often in the low 30s or early 40s in those move tables), rather than evolving it immediately.

How to get and use the Fire Stone in Leaf Green

  • You evolve Vulpix by using a Fire Stone from your bag’s items menu on it.
  • In the Kanto games (FireRed/LeafGreen), Fire Stones are available from Celadon Department Store, which is the classic way to evolve Vulpix there.

Story-style example:
You raise your Vulpix through the mid‑game, let it learn a strong fire move, then roll into Celadon, buy a Fire Stone, and evolve it before the next big Gym so your new Ninetales can sweep with higher Special Attack and Speed.

Mini FAQ

Q: Can I evolve Vulpix immediately when I catch it?
Yes, you can, because there’s no level requirement—any level Vulpix can evolve as soon as you use a Fire Stone. It’s just not recommended if you still want it to learn better moves naturally.

Q: What if I don’t care about its natural moves?
If you plan to rely on TMs and move tutors instead, you can evolve earlier for the stat boost and style points.

HTML table: evolution basics

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Question Answer (Leaf Green)
How does Vulpix evolve? Use a Fire Stone; it does not evolve by level.
Fixed level to evolve? No fixed level; you choose when to use the stone.
General timing advice Wait until Vulpix learns its key fire moves (like Flamethrower in that gen) before evolving.
Main drawback of early evolution Ninetales learns few or no level‑up moves, so you may miss strong natural attacks.
How to get a Fire Stone Buy one at Celadon Department Store in the Kanto GBA titles.
**TL;DR:** In Leaf Green, keep Vulpix unevolved until it learns the strong fire‑type moves you want, then evolve it with a Fire Stone so your Ninetales is powerful and still has a good moveset.

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