Elizabeth's Magearna

Elizabeth's Magearna was a Pokémon she obtained as a Legendary Guardian in Alola.

History
Magearna was hatched from an Egg produced by the Magearna that was created over 500 years ago by Nikola. Intended to be a companion to the other Magearna and the royal family, it grew up in peace alongside them in the Azoth Kingdom.

Eventually, Alva discovered there was another Magearna living in the Kingdom and planned to sell it on the black market for a high price, as well as expiriment on it. He arrived when the family wasn't looking and kidnapped it.

For months, Magearna was subjected to daily painful experiments involving Alva's Mega Waves to create a Mega evolved form for it, and dripping burning chemicals in its eyes to see if an artificial Pokémon has the same capacity to suffer as a natural Pokémon does.

Months later, Magearna had enough and decided to leave the Kalos region to escape Alva's cruel treatment. It didn't want to leave its friends and the family, but knew it wouldn't be safe otherwise. Thus, it fled to Ten Carat Hill in Alola.