Artisan Cave is one of the new Areas discovered in Pokémon Emerald situated in the Battle Frontier

It is a rather basic Cave. It's long, has two levels, many stairs and a Rare Candy
It is also a quick way through the other side of Battle Frontier like a Shortcut. The Entrance is discovered by surfing south of the Battle Palace and then West and the exit is right next to the Battle Tower

Wild Pokémon in Artisan Cave

Here are the Pokémon you will find in the wild in Artisan Cave:

In The Cave
Smeargle Always