It's actually a sidequest called UFO sightings, there are total of four UFO's to spot, after that you can battle one, which leads you to PuPu, a friendly monster asking certain amount of Elixirs after which he gives you his card. UFO's can be seen at these spots:
- Mandy Beach
- Winhill Bluffs
- Kashkabald Desert
- Heath Peninsula
Hope this helps.
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