Mystery on a Deserted Island!

Ash, Serena, Clemont, and Bonnie make it to Professor Sycamore's Pokémon Summer Camp, where they meet Shauna, Trevor, and Tierno, who have received Bulbasaur, Charmander, and Squirtle from Professor Sycamore for their first Pokémon, and want to test their skills against Ash and his friends.