You can run in grass many times, but the chance is very small that you'll get one. Can also use the masuda method. (;
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Axew, Fraxure, Haxorus Druddigon
Druddigon is weak against dragon and ice type pokemon
Druddigon is a Dragon-type Pokemon, so it's weak to Dragon, Ice, and Fairy attacks.
No they programmed the game so you can't catch shiny victini, reshiram, and zekrom. All other pokemon can be found shiny.
You can get Zoroark by trading an Event shiny beast Pokemon to Pokemon Black and White via the Relocator.