Union Cave (Japanese: つながりのどうくつ Bond Cave) is a location in Johto. The main cave divides Route 32 from Route 33, though several other exits in the basement levels of the cave lead to the Ruins of Alph. A wild Lapras can also be encountered deep in the cave every Friday. You need Surf to reach the Lapras.

Route 33 is an east-west route in southern Johto. It is extremely short, and players need only to face one Trainer before arriving at Azalea Town. It is always raining on this route. The fifth route that Trainers from New Bark encounter, Route 33 is a first short route that travels west to Azalea Town. This route isn't meant to be a very long one, since Trainers have already traveled through Union Cave and passed Route 32 to reach this clearing. After exiting Union Cave through a small opening, the player will find a small clearing with a sign. After climbing down the stairs or jumping the ledge, the player can either go west, or find a patch of tall grass where Pokémon from previous routes seem to appear.