How can you get the vortex stone in red rescue team?

You can't get the Vortex Stone in Pokémon Mystery Dungeon: Red Rescue Team.

The Vortex Stone is a key item in Pokémon Mystery Dungeon: Explorers of Time, Darkness, and Sky, which are sequels to Red Rescue Team. It is used to open a portal to the Temporal Tower, a crucial location in those games.

Red Rescue Team focuses on a different storyline and doesn't include the Vortex Stone or the Temporal Tower.