Multi-account spoofers holding gyms
There is this group of players (some legit, but most spoofer) who holds 5 gyms in an area in Hougang, Singapore, in Mystic and Instinct.
The "leader" is very well-known by all PoGo players across Hougang town. He is infamous for hogging gyms well past the 8h 20min mark, on all of his 4 accounts!
The spoofers will guard the gyms 24/7. i.e. there will always be someone on "duty" to defend the gym, or attack if "outsiders" enter. If any other player (from any team) enters any of the 5 gyms, the entire gym will go down within 30 minutes, and go back to the same team shortly after. Any Valor gym there gets attacked immediately as soon as it goes up.
He has 4 main accounts, with very obvious names, as well as smurf berry-feeder accounts. He also spoofs to other parts of Hougang town, though he doesn't hog other gyms.

Answers
This is what I've read somewhere:
Some players (and spoofers) have even organised a war on him, and took turns to fight the gyms with his Pokemon in them, for 5 hours non stop! The intention of this war was to exhaust all his resources (GRBs and healing items), so they can't continue to hog the gyms. There were at least 30 players physically at the gyms (most of them using many devices), and a lot more spoofing.
This was part 1 of the war: Exhausting their GRBs. After the onslaught, the berry count for the Pokemon in the gym was about 200 for each Pokemon, a whopping total of 1,200 berries for all 6 Pokemon! And that's for only 1 gym.
When the gyms finally went down after many hours (no exaggeration) of non-stop battling, it was time for part 2 of the war: Defending the gym against them, to exhaust their potions and revives. All 5 gyms were attacked simultaneously by their group. The group spent a week stocking up on GRBs and potions on many accounts by driving between raids. Again, the spoofers went on attacking for hours, while the group defended like crazy. This time, the spoofers persisted for over 12 hours!
But an infamous local spoofer/botter joined in, and used his bot program to feed thousands of GRBs over the 12 hours with his bot accounts.
Now, the spoofers are not as active as before. But they are definitely going to come back.
1) No such thing as hogging gyms.
2) Quit the game or accept some people just don’t play by the rules . I don’t condone it either but there is nothing you can do about it.
3) These posts about multiple accounts are getting redundant.
LAST Max out your Machamp cause 3200 CP Blissey’s aren’t really a problem before you start to complain about them again too in the future.