You look a bit ill-equipped for an impromptu journey to the center of the earth, Jules Verne. As far as I know, there is a way out at the very bottom, but I've been led to believe you're in need of a rescue, and not just directions.

[The sound of a Pokeball opening somewhere up above rapidly follows, and shortly thereafter, a pair of long green vines begin winding their way down into the pit.]

So if you're going my way, let me give you a lift.