A Flareon would be better than a similarly-leveled Ponyta because it has already evolved. Evolution raises a Pokemon's stats significantly.
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Here are some of the ones you can get without trading/migrating: Cyndaquil, Quilava, Typhlosion Flareon Vulpix, Ninetales Growlithe, Arcanine Magby, Magmar Ponyta, Rapidash Legendaries: Moltres, Entei, Ho-oh
ponyta evolve in to rapidash
The only fire Pokemon in the Sinnoh region are the Chimchar-Monferno-Infernape evolution chain or the Ponyta-Rapidash evolution chain. However, once you beat the Pokemon League you can get an Eevee and evolve it to Flareon.
A Ponyta evolves on level 40.
ponyta evolves at level 37