No encuentro el botón para Megaevolucionar en Pokémon X

Enter a description of your issue here, in full detail.
Al momento de querer megaevolucionar a mi pokémon no encuentro la forma o el botón para hacerlo.
Psdt: Verifiqué que el pokémon lleve su respectiva piedra para que pueda evolucionar

System Information

  • Operating System: Microsoft Windows 10
  • CPU: Intel(R) Core™ i7-8550U CPU @ 1.80GHz 1.99 GHz
  • GPU:
  • Citra Version (found in title bar): Citra Nigthly 1696
  • Game: Pokémon X
  • Screenshot of Issue (include the full Citra window including titlebar):

Diagnostic Log
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Make sure you’ve reached the Tower of Mastery in-game first. You need to receive a keystone for mega-evolution before you can utilize it in combat.