The legendary shiny dogs event
You need to have gotten a shiny raikou/entei/suicune from a gamestop Pokemon distribution and talk to some lady in a trailer.
go to the 3rd city that has a gym in it (bug type) and talk to the girl or boy ( I forget which one) that says that she or he is talking to the other kid because hes lonely,If you have Celebi in your party then the girl will give you a Zorua, then train it to level 30 to get a Zoruark.(NOTE:You have to have an open spot in your party for this to work.)
You cannot catch Hydreigon on Pokemon White.
you can not catch graveler on Pokemon white Sorry:):):):)
You can't catch celebi in pokemon white.
You can not catch Braviary. You have to catch Rufflet in Pokemon White and evolve it.
No, you cannot catch Darkrai in Pokemon White.
In Pokemon black you catch RESHIRAM and TORNADUS In Pokemon white you catch ZEKROM and THUNDERUS Sources : myself
Yes
No, it is exclusive to Pokemon White. Where you would catch Rufflet in White, you catch Vullaby in Black.
You cannot catch Reshiram in Pokemon White, because it's exclusive to Pokemon Black.
I have Pokemon Black, and as far as i know you cannot catch event legendarys without an event (eg. Genocect, Zorua). You cannot catch some Pokemon on the game, but Pokemon White can, and White can't catch some Pokemon that you can catch on Pokemon White. Lol!