It's important to understand the difference between a location and an item or ability. Western Cave is a place within the game world that you can explore, much like any other dungeon. You cannot "get" it in the same way you might get a new move or a special item.
If you are looking for a specific item or ability that you can find in Western Cave, you would need to provide more information about what you are seeking. Please clarify your question so I can assist you further!