You can buy one in the Celadon department Store.
Celadon mall. You have to buy it.
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ponyta evolves at level 40 or you can use a fire stone.
In Pokemon LeafGreen, to get a Ninetails, you must first capture a Vulpix. Vulpix can be found on Routes 7 and 8, and in the Pokemon Mansion. Once you have obtained a Vulpix, a Fire Stone is needed to evolve it into a Ninetails.
That item doesn't exist in leafgreen.
Arcanine is the evolved form of Growlithe. Neither of them can be caught in the wild on Leaf Green. Growlithe is a Pokemon Fire Red exclusive pokemon. To be able to evolve it, give it a Fire Stone and then trade it to your Leaf Green game.
Use a moon stone on it.