The wings of a Swablu are typically depicted as cumulus clouds, especially in mild climates, for it is this form which these wings most often take. Yet Swablu have long been of use to meteorologists, for every morning their wings emerge into the shape of whatever cloud will be most common on that day, from wispy cirrus wings on which they can barely fly to nimbus wings which tower larger than a Vullaby's.
It is said that Unova's first settlers were led on their journey by a Swablu they believed to be a god. Every day, when the Swablu found a resting spot, they stopped and founded a city on the site of wherever it perched. This Swablu's wings took a different shape every day, including rare cloud patterns which bore little resemblance to any associated weather ever found in Unova's historical record, although if the myths are true the clouds did indeed appear. To honor their Swablu founder, the people of Unova named each and every city after the shape its wings took on that particular day.
Yet no sooner was the settlement of ancient Unova completed than did many of the local gods, such as Reshiram and Zekrom, come to drive away this foreign pokemon back across the sea. Yet it is said that this Swablu could not bear to leave Unova, and after convincing the hostile gods it had left, settled in the notoriously inaccessible Abundant Shrine under the protection of the weather trio, who saw a friend in a creature with wings made of clouds. And those few trainers brave enough to venture deep into the shrine have reported that a community of Swablu still lives there to this day.
