It is an amazing legendary pokemon.
No
by apokemon event or trade
They are in the maniac tunnel.
you dont you pea brain
You have to have seen every Pokemon in the regular dex.
it came out already and has mew and cresselia
You have to beat a gym leader to unlock it
At eterna city.
You can only find Darkrai through a Pokemon Event.
battle island
Arceus obiously