May and the Swablu

From the anime episode, "True Blue Swablu".

Ash and co were going through the forest on their way to Petalburg City, but end up lost on the way. They, then, find this Swablu who couldn't escape from the tree it lived before, which was struck by lightning, and ended up injured, so they try to help it, but the Swablu was very scared and was trying to get away, but its injured wing couldn't let it fly away. The group does get to help Swablu get better and help it to fly later on, befriending May in the process to the point it was about to be part of her team. However, right before May could get Swablu into her Pokeball, the flock of Swablus and Altarias from the beginning of the episode showed up flying in the sky and the Swablu knew it had to leave with them. Swablu was really going to miss May, and so was she.