Gravel
Mr. Poopybutthole
Not sure about Chicago, but LA has a few. The one I used was Barnhill park (NE of La Brea). There's another one somewhere in Long Beach I think that has Squirtles and Dratinis (or maybe it was Bulbasaurs and Dratinis?).Anyone found any reliable dratini dens yet? There's an ice rink by me that seems to spawn 1-2 of them pretty regularly, but it's gonna be a long road to farm the 40 of them or whatever I'll need.
RE: Tuco, it just keeps getting harder to catch shit. I'm 26 now and most of my rattata/pidgeys spawn in the 300+ range and typically waste multiple balls to finally catch.