Kalos walkthrough section
Pokemon X and Y Phase 10: Zygarde (Terminus Cave)
The third Kalos legendary, off-map most of the game. Terminus Cave is on the east end of Route 18.
Phase 10 Post-Game Professor Sycamore Kalos Professor Looker Bureau, Kiloude, Mewtwo, Zygarde, and Mega Stones. 10 / 10 
Phase 10 section 7 of 15
The third Kalos legendary, off-map most of the game. Terminus Cave is on the east end of Route 18.
Zygarde (Terminus Cave)
The third Kalos legendary, off-map most of the game. Terminus Cave is on the east end of Route 18. The deepest chamber holds Zygarde — but the Ace Trainer guarding the entrance won't let you in until you're Champion.
Zygarde (50% Forme)
Moves: Dragon Pulse, Camouflage, Earthquake, Crunch.
Aura Break: Reverses Fairy Aura and Dark Aura effects (so Xerneas/Yveltal lose their abilities' boost when battling Zygarde).
How to find it: Fly to Couriway. North on Route 18, find Terminus Cave entrance. Inside, navigate through (you'll need Strength + Rock Smash). The Ace Trainer in front of Zygarde's chamber moves aside post-Hall of Fame. Walk in, save, fight Zygarde.
- Save before the chamber.
- Lead with False Swipe + Stun Spore / Glare for paralysis.
- Avoid switching — Zygarde's Crunch will hit your Ghosts hard.
- After 20+ turns, Timer Balls become 3× catch rate.
- Dusk Balls work too (Terminus Cave is dark).
- Master Ball is a guaranteed answer if you saved it.
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