Ash finds a message in a bottle from a girl named Marissa. She asks for help to find a Crystal Onix somewhere on the island. The reason is her brother Mateo, doesn't feel inspired enough to work on glasswork and needs the Onix to be inspired again. Can they find it?
When Tracy calls out Venonat and Marill his pokeballs doesn't open up.
When Ash and co find the island where the Crystal Onix is on a sand bar path reveals itself because the tides go down, however tides don't go down that quickly and if it was a sand bar then the water doesn't need to leave because it would be shallow enough to walk across the water.
This is the second episode to introduce a Generation II Pokémon.
A sound clip of Marissa can be heard at the Tara Sands official website.
Meowth breaks the fourth wall when he tells the camera to pan down to him before saying his next line.
The "Who's that Pokémon?" in this episode is Rhyhorn.