i did clear it and that road is still blocked by cleared i mean i did both the special luna and sol trainer/did the cave with mawile/freed the for the lighthouse/freed the corsola
Try going into the houses in town, in particular the one in the lower right side :)
Thanks for catching the sewer issue, that's one that's plagued me for a few versions now. I think it should now be working on my next release version! (2.2)