The quest is ok?

I did all the steps, I install the CD on the computers and defeat Wally, but after a few minutes the security guard did not let me in anymore.

I went to talk to Wattson again and he asks me to fix the PCs... again. :/

Help?

for me it was 3 centers not 5 of them

i just went to random 1s in hoenn starting with the closest 1 and did it until i unlocked it

I think this Quest got an update. After "5. Follow the way to the north and find Wattson and the team leaders.", Wattson asked me to find Plusle and Minun to turn the generators on.

After I found them, Wattson gave me the CD and I had to install it at 3 Computers instead of 5 (Oldale, Lavaridge and Sootopolis).

After five:

Then I got the CD and had to install it at three specific computers (Oldale, Lavaridge and Sootopolis).

 

Hope this update helps :)