You get to catch him at the end of the game. (P.S: I know this because I beat the game.)
yes if it is darkrai riluo or manaphey
You can only trade a Darkrai, Riolu and Manaphy egg obtainable by doing Wi-Fi missions
Shadows of Almia
Darkrai
You can't have a Darkrai as your friend pokemon, I think, but the final boss at Altru Tower is a Darkrai.
INFERNAPE
Aerodactyl
Darkrai
97 is eevee.
Sorry you can't
you have to beat darkria
Peril Cliffs.