No, um, let's see if I can explain myself better.
If you started your reborn game in episode 11 (as I did), there was an event Ralts obtainable early in the game. As soon as you could get to the low Peridot ward, in the same street as Julia's gym is there was a guy standing in a side of the street, blocking the path that leads to an alley. The guy asked you to give him 50$, like, 6/7 times (a maximum of 300$ I think I gave him) and then he just moved to a side and you could enter the alley. In the alley a door leads to a room in which there was a scared Ralts, that you would need to give a pokésnax in order to make him/her join you.
If you didn't play episode 11, I think there's a chance that the event is still there if you simply download episode 11 from the internet or a friend who can give it to you. That's the way how I got Riolu, by just downloading episode 10 (in which Riolu was obtainable) and playing my savefile with it.
As for the new event, it is NOT located in 7th street, and you can in fact find the pokeball that contains a Ralts as soon as you get to the underground railnet with a poké that knows rock smash; there're these "dark spots" in the walls in which you can rocksmash to break said walls and find items in the holes. One of those items is Ralts' pokeball. However, the pokeball is "corrupted", and you have to bring it to a guy in the pokeball shop that will tell you he can open the ball if you bring him some (magnet?) powder, an item that can only be found, I think, on 7th street. That's why you need access to 7th street to complete this new event and get Ralts.