Final Fantasy X-2/Chapter 1/Mushroom Rock Road

The LeBlanc Syndicate is at it again!

Follow Ormi and Logos to the bottom of the gorge - it's a crevasse with steps, you can't miss it. This will trigger a cutscene where you get a crimson sphere. Talk to the person at the small area's exit. Exit the gorge and make your way to MR's Youth Leage HQ. It's where you fought the bug guy in FFX. Talk to everyone at least twice, and don't skip Maechen's story.