There's a EXP farm in Hong Kong that gives around 160k - 170k EXP Per HR
(EXP goes up and down, Decent Pokemons, Suggest Changing location every 1-2 Hours)
Coordinates: 22.285661566028704 ,114.15020227432251
Another EXP farm is in Tokyo Disneyland gives around 160k EXP Per HR
(Stable EXP, Good Pokemons)
Coordinates: 35.633511709084274 ,139.87992525100708
Found another EXP farm, Not as good as the first two, Sydney Hyde Park gives around 130k EXP Per HR
(Stable EXP, Bad Pokemons, 200~ Pokestops)
Coordinates: 22.285661566028704 , 114.150202274322
Found an EXP farm that is pretty decent, Tokyo Shinjuku Chuo Park, gives around 150k - 160k EXP Per HR
(Stable EXP, 140~ Pokestops)
Coordinates: 35.6894568822069 , 139.69079732894897
Decent EXP farm, Myrtle Beach, gives around 120k - 130k EXP Per HR
(Exp Goes up and down, 40-50 Pokestops, Sometimes spawn rare pokemons, Suggest Changing Location every 1-2 Hours)
Coordinates: 33.714451 , -78.877194
EXP farm in San Francisco, gives around 110k - 120k EXP Per HR
(Stable EXP, 120~ Pokestops)
Coordinates: 37.779669924659004 , -122.41138458251953
EXP farm in Santa Monica, gives around 120k - 130k EXP Per HR
(Mostly Stable EXP, Really decent pokemons)
Coordinates: 34.012257773782864,-118.4944152832031
EXP farm in Central Park, gives around 100 - 110k EXP Per HR
(Stable EXP, Bunch of pokestops with lures, Decent pokemons)
Coordinates: 40.779014 , -73.968447
EXP farm in Time Square New York, gives around 140-160k EXP Per HR
(Stable EXP, Mostly Magnemite, Bulbasaur, Squirtle, and Pinsir, 80~ pokestops)
Coordinates: 40.758846660085474 , -73.98512810468674