How do you get through the old slate that depicts a Pokemon in ranger 3?

You can't actually get through the old slate in Pokémon Ranger 3: Shadows of Almia. The slate is just a decorative element in the game and has no gameplay function.

It's there to add to the story and atmosphere, specifically to show the connection between the ancient Almia civilization and the Pokémon that live there.

If you are looking for a specific item or a way to progress in the game, you might be thinking of something else. Can you please give me more context about what you're looking for?