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Alright I gave pic related the benefit of the doubt before, but now I know he definitely spoofs or uses something like GPSFly. I remember the first time he took my gym a few times the moment I just left it, I figured he might live in the appartement next to the gym. However it happend again yesterday and today at a whole different location in town. That gym could only be reached from the position I was standing at. No cars or brushes to hide behind either. Put a mon in there and a second later it was already down again.
I'm going to try report him, but I doubt Niantic actually does something about reports anymore. At least I laughed a bit when I put another low CP mon in there with the name "Using GPSfly?" and he immediately stopped taking back the gym.