Zygarde cells Suck!

I made the bad decision to bottle cap my Zygarde. Major regrets. These cells to evolve him are so annoying to attain. Why doesn't every route just automatically give you a cell at the end? I understand getting a cell on the same route in a day and not getting a cell on that. But each new route per day (even if it's just 3 routes per day) ought to automatically give you a cell. I walked 3 routes today. Got none. The last route, there was a pokemon in the way and I tapped on it trying to get the cell. Once I got out of it, the cell had disappeared. I've tried the trick of logging out of a route at the end and then logging back in. Nothing. Automatic cells at the end of a route. How is that hard? We are making the effort to walk a route (which are annoying in so many ways), at least guarantee a damn cell at the end! /rant