just raise it happiness by let it hold soothe bell, give it cabos,calcium...and the last step is train it
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Yes, with high enough happiness it will evolve through battle (after you obtain the national dex).
It evolves at lvl 22 into golbat then Crobat by getting max happens
Ada
Tangela does not evolve in Fire Red.
A total of three Pokemon evolve using the Fire Stone: Vulpix, Eevee, and Growlithe.