You were walking around the beach near your house, with your starter (any starter Pokemon), just relaxing and enjoying the waves. Your mother said that you can have a picnic with your partner Pokémon, before you depart on your adventure, with Nemona. As you took a corner, you heard a crash, and a whimper.

Koraidon lays there on the shore. It's head rested on the sand. It's eyes stirred open, it looked up and saw you, causing it to perk up. It sniffed out something. Perhaps it wants something?