ugh crap that sucks man, i'm sorry, i think there will be more common just keep raiding at that place and any others you know of.
i just finished mine too but i got it. i would be upset too. i have to say i was stressed out because i came late and missed an 8 group. no idea why was so not crowded. anyway, i waited for like 30 mins and went in with like 4 ppl and couldn't finish and then 5 and couldn't finish and then finally at the half hour mark went in with 6 ppl. I'll be damned if the 6th person didn't go in there with a senteret, and a staryu! i wanted to punch him in the face. then we finished it. i think all their mons fainted and i was in there alone for a while, then I got hime with like 40 secs left. i think. anyways. sorry man, i think it will be common, don't sweat it.