Yeah, Route 119, not Route 120. My bad. x_x But still, yeah Gloom is there alright.
And the Personalocke stemmed from a Marriland forums user by the name of Heyis4Horses, who first jumped onto the scene a year ago with a Black Nuzlocke that disallowed bag items in battle or depositing Pokémon. For how tough BW are known to be, he was doing pretty good until after the eighth badge where he had massacre after massacre - one in Victory Road, one to the Elite Four, one (I kid you not) during training, and the last one against N and Ghetsis, but he still won. After that came his Platinum Personalocke, which, despite a decently low amount of deaths, still required him to strategize and plan his team well. The final team he went in with was very original, I must say - Golduck, Gliscor, Luxray, Drifloon, Lucario and Glalie (although that last one got no use in the final fights).
Another forum user there is in the middle of that same challenge on Platinum, while I have my first one on Black currently. I have already played quite a bit in advance from where i've posted, and I don't want to go too much into it yet but you'll see that stage soon enough.