Bio
Olympia is the Gym Leader of the Anistar Gym and she awards trainers that defeat her the Psychic Badge. She is a strong Psychic who can see the past and the future through the use of Future Sight.
Sheryl explained that Olympia learns about the future by being guided by the voice of the stars. The incident off the coast of Houen was also allowed he to predict the incident with Groudon and Kyogre beforehand. Even though the world suffered from abnormal weather, her prediction enabled people in the Kalos region to take all possible countermeasures, so nothing serious happened.
Pokemon (2)

Olympia's Meowstic♂ is one of the two Meowstic that Olympia has as her main partners. It battled against Ash's Talonflame and Ash's Frogadier in a double battle gym fight. Its Ability is Prankster which allows it to preemptively activate supporting moves such as Light Screen. That's why it could protect the female before the attack from Ash and his Pokémon could hit.

Olympia's Meowstic♀ is one of the two Meowstic that Olympia has as her main partners. It battled against Ash's Talonflame and Ash's Frogadier in a double battle gym fight. Its Ability is Keen Eye which makes it extremely difficult for opponents to evade moves.
Episodes (9)

All Eyes on the Future!ヒャッコクジムのダブルバトル!ゴジカの未来予知!!Double Battle at the Hyakkoku Gym! Gojika's Future Sight!!

The Synchronicity Test!サトシとアラン!ゲッコウガVSメガリザードンふたたび!!Satoshi and Alan! Gekkouga VS Mega Lizardon Once Again!!

Championing A Research Battle!サトシ対チャンピオン・カルネ!VSメガサーナイト!!Satoshi VS Champion Carne! VS Mega Sirknight!!

A League of His Own!カロスリーグ開幕!メガリザードン対決・X対Y!!The Kalos League Begins! Mega Lizardon Showdown: X VS Y!!

A Towering Takeover!襲撃フレア団!プリズムタワーのジガルデ!!The Flare Gang Attacks! The Zygarde at the Prism Tower!!

Forming A More Perfect Union!反撃のジガルデ!カロス最終決戦!!Zygarde Fights Back! The Final Battle for Kalos!!