Rock Tunnel

A dark place, devoid of light...Without a pokemon that could brighten it with a FLASH attack, or one that could light your way with a flame of some sort, you're in for quite a few falls, bruises, and attacks by wild pokemon.

Probably some challengers to, but if you didn't see them, they might not see you.

And if you aren't lucky at all, you may fall down a deep, deep, hole.

I hope you don't, so good luck!