Nosta

Hello guys, i am a new player of Pokemon Reborn and i recently cleared the agate city story segment. Thus, i was working towards completing the poxedex for bee's quest. I did the special encounter to receive my riolu egg but after it hatched I released it by mistake., without making it evolve into lucario. Could someone please tell me if there is another way to obtain this pokemon or trade me another riolu if the first option doesn't exist. I would be very grateful. Thanks in advance.