Which dungeon can you find wurmple in Pokemon Red Rescue Team?

You can find Wurmple in Ever Grande Cave in Pokémon Red Rescue Team. It's found on the 3rd floor of the cave, specifically in the grass patch on the left side of the screen.

Remember that finding a specific Pokémon is random, even if they're in the location they're supposed to be. You might need to explore the cave and the grass patch a few times before you encounter a Wurmple.