Chrisbutanime

hi i got a problem where i traded with a random guy "Strexx" cause he wanted me to help him evolve an onix. well we traded and now it says the onix is locked and i cant return it??? from what i know to unlock it i have to beat region were it was caught (johto) and i just bearly finished kanto and he wants his onix fast so i dont know what to do. is there any way to return it without getting reported for scamming or beating johto?