Swellow cannot evolve, as it has already reached its final form.
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At level 22 it evolves into Swellow.
taillow
I know Taillow evolves to Swellow but after that Swellow won't be able to evolve.Answer Swellow is one of the few Pokemon who only has one evoltion. (from Taillow to Swellow)
At level 38, Swellow learns Arial Ace.
breed a female swellow or tailow with a male altaria that knows sky attack breed a female swellow or tailow with a male altaria that knows sky attack