From MLB Power Pros Wiki

Summary

The Legendary Cave events are a series of events in Success Mode 2008 that form a side story.

Events

1st Event:

Marvin talks about a legendary cave somewhere in the mountains. He has a treasure map with something written in Latin, which Marvin recites:

When you see the waterfall inside the case, follow the river.
You will then find brightly shining treasure above the lake.

• Ok, let's go! - Energy +?
• 'This can't be real'.