the date is unknown and yet to be classified
Keldeo, Genesect, and 2 other Pokemon
go to map land 6 but you must beat all gym leaders including the elite four
You can get Mew by trading with others. There are a handful of people who are offering Mew for other event Pokemon like Genesect, Keldeo, Celebi, and so on. Mew can also be obtained by participating events that Nintendo officially distribute. Depending on the event type, you may have to visit a local game store or using the Wi-Fi to download it. If you have a Mew from Pokemon Black, White, Black 2, or White 2, you can use the transfer software that was included with Pokemon Bank to get it from those games to Omega Ruby and Alpha Sapphire.
You can catch legendaries in any Pokemon game! (At least after you know where they're hiding!)
It allows you to trade the event Celebi and the shiny event Entei, Raikou and Suicune from one of the other games. Normally pokemon can only be migrated after you complete the game and reach the pokemon transfer lab. But the Relocator lets you bring over those event pokemon so you can get Zorua and Zoroark before completing the game.
Keldeo, Genesect, and 2 other Pokemon
At the time that I am typing this answer, and as far as I know, there is not yet a real way to obtain Genesect. It can not be found through normal gameplay, only through an event. No event for Genesect has happened in the USA yet, so it is not yet possible to obtain Genesect other than cheating. It is true the only way is cheating the possible term is action replay
go to map land 6 but you must beat all gym leaders including the elite four
Victini, Cobalion, Terrakion, Virizion, Tornadus, Thundurus, Landorus, Kyurem, Meloetta, Keldeo, and Genesect.
You can get Mew by trading with others. There are a handful of people who are offering Mew for other event Pokemon like Genesect, Keldeo, Celebi, and so on. Mew can also be obtained by participating events that Nintendo officially distribute. Depending on the event type, you may have to visit a local game store or using the Wi-Fi to download it. If you have a Mew from Pokemon Black, White, Black 2, or White 2, you can use the transfer software that was included with Pokemon Bank to get it from those games to Omega Ruby and Alpha Sapphire.
You can catch legendaries in any Pokemon game! (At least after you know where they're hiding!)
normal gameplay: Zekrom, Kuyrem, Virizon, cobalion, terrakion, thundurus Events: victini, genesect, keledo, mellotta other: landorus (obtain thundurus and tornadus [the pokemon black equivilant of thundurus] an bring them to the shrine on route 14. you will then encounter a lv 70 landorus.)
Genesect is a special Pokemon that you get during the special events, like when you download it at Gamestop. You can get the drives for it at the p2 Laboratory, but it isn't possible to get it yet. The other two Gen. V special events that haven't come out yet are Meloetta and Keldeo. (I think it's meloetta.)
You can only get Genesect once per save file while the character distribution is going on but you can get it as much as you want as long as you keep on trading the Genesect away to another game and then deleting the other game's save file and creating a new one.
To use the relocator in Pokemon black you must have: -Another Pokemon DS game other than Pokemon black or white -one of these event Pokemon on that game(which were ds download at Gamestop) -Shiny suicune, raiku, or entei -Celebii -And another ds Now put the ds with the other ds game on ds download while on Pokemon black go to the title screen and scroll to the bottom until you see relocator. when they connect you should be able to transfer THOSE EVENT POKEMON ONLY hope i helped
Can get REGIGIGAS and other event Pokemon like darkrai online at http://cgi.eBay.co.UK/ws/eBayISAPI.dll?ViewItem&item=140308748984 other event Pokemon on there aswell check the other items
Pokemon White, and other copies of Pokemon Black.