you have to be lucky
NO.
the daycare
Nope, repel is a shiny's worst enemy >:(
You can get Zoroark by trading an Event shiny beast Pokemon to Pokemon Black and White via the Relocator.
see the shiny Pokemon u want about um lets say 187 times then the next time it will be shiny (i did this with a slowpoke on Pokemon black and white) if u try to get a shiny legendry save in front of the legendry then battle it if it not shiny turn off your game and battle it again till its shiny but don't bother doing this on reshiram zekrom or victini because they have shiny sprites but they will not appear because they are legally set so u cant get the shiny sprites so u have to hack to get shiny zekrom victini and reshiram but this works with virizion terrikion cobilion and kyurem hope this helps =D
You can get Zoroark by trading an Event shiny beast Pokemon to Pokemon Black and White via the Relocator.
It increases the chance of finding shiny pokemon. How much is currently unknown.
Minccino
You cant trade black and white Pokemon to another game. They wouldn't have the sprite for it since they didnt make the sprites for black and white Pokemon in previous generations. Also the Pokemon move. They cant make Pokemon move in the previous generations.
Minccino evolves with the Shiny Stone!
If you mean how to get shiny pokemon in Black and White, then it's all by chance. The odds to find a shiny are 1 in 1892. That's only 0.0122% of a chance. They are random to find. You can also use Action Replay to cheat yourself some shinies.
You need a Shiny Stone to evolve into Cinccino.