Charizardite
Items pocket
Bought or exchanged
- Dragon’s Den Shrine (costs Mystery Stone ×1) · see Four Island: the Mystery Stone buyer (don't sell it), Cerulean Cave: Giovanni's duel and the Charizardite, Dragon Shrine: the Mystery Stone becomes a Charizardite, and the Dragon Rush tutor
- Cerulean Cave, inner room (costs Mystery Stone ×1) · see Cerulean Cave: Giovanni's duel and the Charizardite
Held-item transformation
- Charizard holding Charizardite becomes Mega Charizard X. Any nature except Timid or Modest.
- Charizard holding Charizardite becomes Mega Charizard Y. Timid or Modest nature.
These are held-item transformations, not permanent evolutions. Removing the required item returns the Pokémon to its base form. The transformation rules are verified in the game code; every animation and item-change sequence has not been replayed.
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