Kalos walkthrough section
Pokemon X and Y Phase 10: Mewtwo (Unknown Dungeon)
The OG legendary — Mewtwo lives in a hidden chamber at the back of Pokemon Village called the Unknown Dungeon .
Phase 10 Post-Game Professor Sycamore Kalos Professor Looker Bureau, Kiloude, Mewtwo, Zygarde, and Mega Stones. 10 / 10 
Phase 10 section 6 of 15
The OG legendary — Mewtwo lives in a hidden chamber at the back of Pokemon Village called the Unknown Dungeon .
Mewtwo (Unknown Dungeon)
The OG legendary — Mewtwo lives in a hidden chamber at the back of Pokémon Village called the Unknown Dungeon. Lv 70. The cave entrance was blocked during Phase 8; it opens after Hall of Fame.
Mewtwo
Moves: Psychic, Aura Sphere, Barrier, Recover.
Drops: ★ ★ ★ Mewtwonite X (Pokémon X) or Mewtwonite Y (Pokémon Y) when caught — different Mega per version. Mega Mewtwo X is Psychic/Fighting (Steadfast). Mega Mewtwo Y is pure Psychic (Insomnia, massive Sp.Atk).
How to find it: Fly to Snowbelle, head to Route 20 (Winding Woods), through to Pokémon Village. At the back of the village, the previously-blocked cave is now open — enter the Unknown Dungeon. Mewtwo is in the central chamber.
- Save before the chamber.
- Lead with a False Swipe user (Pangoro, Bisharp, Gallade). Recover means Mewtwo can heal back — be patient.
- Status: Thunder Wave (Klefki Prankster) or Sleep Powder (Vileplume/Amoonguss) — paralysis/sleep boost catch rate.
- Watch Barrier — boosts Defense by 2 stages. Doesn't affect your special hits but matters for False Swipe.
- Start throwing Ultra Balls / Dusk Balls (the cave is dark — Dusk Ball gets 3.5× multiplier).
- Timer Balls become more effective after 20+ turns.
- If you have Master Ball still: 100% guaranteed catch.
Version Note — Mewtwonite
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