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If you are in Guwahati (or in Assam) you might be having a hard time finding any Pokemons or Pokestops here. My friends in other cities and countries are lucky, there have loads of Pokestops, Gyms and Pokemons around them and they're having fun playing it.
First of all we need to know what Pokestops are and where they are added from on the real World map, so to find that out we take a look at the support article on Pokemon Go's website:
PokéStops are locations where you can gather items such as Poké Balls, Potions, and Eggs.
A PokéStop will change its shape when you walk close enough. Touch it to interact with it, and spin the Photo Disc to get items.
This doesn't answer why we don't find any Pokemons here, but it is pretty obvious that as there are probably Pokestops we are ought to not find any Pokemons as well.