This article brought to you by Custom Event Pokémon News, your Pokémon community newspaper.
Mewtwo and the shiny Genesect are both to be distributed to promote the sixteenth Pokémon Movie.
Update on June 19, 2013: A secret minisite, which was based on the sixteenth Pokémon Movie, was announced, and the Red Genesect page was instead featured in that minisite.
Crystal have revealed an information here on the Movie 16 Pokémon distributions. The attacks and held item of the alternate color Genesect have been revealed, as well as an event that the fans of Pajama Sam will be able to obtain a Fateful Encounter Mewtwo at Fanfiction.Net 18 days ago.
A GTS distribution of Mewtwo happens today. Its URL can be found at Fanfiction.Net that features a story called "Pajama Sam: No Need to Fear When There's a Doctor in Here!", located at the bottom of the story. That event already happened 18 days ago (May 7, 2013), and it ends on June 24, 2013.
This Mewtwo will be level 100, know the moves Psystrike, Ice Beam, Hurricane and Heal Pulse, and will be holding a Custap Berry.
It was unknown when transferring from Generation V to Generation VI is revealed just yet, but the event Mewtwo will appear to transform MegaMewtwo when it appeared in Pokémon X and Y.
Genesect's known moves are Techno Blast, Extremespeed, Blaze Kick, and Shift Gear, and will be holding a Choice Scarf.
The password for the shiny Genesect was found in a .zip file titled "Teenage Mutant Ninja Turtles IV - Turtles in Time", which was available for download at DeviantART.com on July 13, the movie's premiere date. That file also contains a Teenage Mutant Ninja Turtles IV: Turtles in Time SNES ROM, and ZNES emulator, and a shiny Genesect card. When the password is entered at the page in the secret minisite, which was based on the sixteenth Pokémon Movie, the shiny Genesect is unlocked to be obtained.
A Meloetta event was also leaked, as it is said to distribute sometime on June 5 to 18, 2013. It was unknown that it'll happen on that date.