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.
Ponyta evolves into rapidash at level 40.
ponyta evolves at level 37