Legendary Pokémon

Pokebeach Wrote:The Delta Episode, keeping the same name in English, "involves the history of the Hoenn region, reaching 3,000 years into the past, and makes the mysteries of Mega Evolution clear at long last. The episode thrusts Trainers into a quest to save the world - the Mossdeep Space Center, a research facility for studying space and rocket science, discovers that a giant asteroid is hurtling toward the planet. Trainers must stop Team Magma and Team Aqua from attacking the facility. Meanwhile, a battle in space is brewing between the Sky High Pokemon Rayquaza and the DNA Pokemon Deoxys. Rayquaza faces a fateful challenge that will determine the future of Hoenn. Helping Trainers restore peace to the Hoenn region are Sootopolis City's Gym Leader, Wallace, and the Hoenn region’s Champion, Steven, both of whom hold secrets to stopping the asteroid."
ZinniaZinnia Delta Episode

"Trainers will also meet Zinnia, a mysterious girl rumored to possess the key to the fate of the world. She bears a certain destiny. Zinnia wears a Mega Anklet set with one of the mysterious Key Stones, which allows her Salamence to Mega Evolve." Her name in other languages is Amaryllis, Lyris, Amalia, Tristana, and Higana.

We also learn that "even as the asteroid approaches, there is new movement from Team Magma or Team Aqua, depending on which game you play. It appears that either Courtney / Matt is targeting Trainers to steal the Key Stones needed to make Pokemon Mega Evolve."