Clarissa's Lucario

Clarissa's Lucario is her first Pokémon she ever caught and her 1st overall.

History
Lucario was obtained by Clarissa when he was a Riolu on Shamouti Island. It is unknown how Riolu washed up on the island, just that he was very weak when found. Riolu later evolved into Lucario after protecting Clarissa from one of her classmates. After saving it, Clarissa and Lucario bonded and started her Pokémon journey at age 10.

In Johto Lucario evolved into Mega Lucario, making him the first Pokemon she had ever Mega Evolved. However this didn't turn out well, Lucario's bond wasn't strong enough. He viscously attacked Clarissa until Charizard intervened and knocked Lucario out. Lucario was temporarily sent to Oak's to be studied as he had not calmed down when being returned to his Pokeball. Lucario soon returned normal with a heavy heart. He soon returned to his Happy Go-Luck attitude after returning.

Trivia

 * Lucario is the second one of it's species that belongs to it's Aura Guardian that disobeyed after Mega Evolving.
 * The first was Korrina's Lucario
 * TBA