Since "Pokémon Go"took over the world, app developers have engineered different tools to help you catch Pokémon. There's PokeNotify, which sends you push notifications when the Pokémon you want are near by. There's Pokevision, an online map that shows you nearby Pokémon, and there's Poké Radar, which is a crowdsourced Pokémon map.
All of these apps have their issues. With PokeNotify, for example, you can't adjust the range at which the app will look for Pokémon, so sometimes it'll find one a kilometer away, which isn't helpful. Other apps have shut down, or stripped themselves of features, because Niantic doesn't want them to exist. Many of them technically break the game's terms of service.
Enter PokéMesh. It's the only "Pokémon Go" app you need. It's an Android app (sorry iPhone users) that shows you a map of all of the Pokémon, pokéstops, and gyms nearby. It'll show you how much time you have left until each Pokémon disappears, and can filter out the ones you're not interested in (so long Rattata!). If you want, you can also have the app run in the background and notify you when particular Pokémon appear, like PokeNotify.
I should warn you: Like all apps that require your "Pokémon Go" login information, PokéMesh can get your account banned from the game. Niantic doesn't approve of many third party apps, and if they deem that PokéMesh violates its terms of service, they might shut down accounts that use it. If you're willing to risk that, then go ahead and use it. You can also try the Ingress method.
But if you're brave, or have multiple "Pokémon Go" accounts, you should use PokéMesh. It's great.
Here's how it works:
When you first go into the app, it'll find your location and show every Pokémon, pokestop, and gym nearby.
The pokestops and gym notifications were making the screen too busy, so I swiped from the left side of the screen and went into the settings.
From there, you can remove pokestops and gyms from the display.
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