There are a lot of web sites, chat groups, reference data, etc. that provide a lot of resources. Here are a bunch of places that you might find useful.
There are a lot of secrets that Niantic doesn't document, but have been found and shared by other trainers.
This page outlines a selection of those secrets.
There are a number of web sites out there that are geared for Pokémon GO trainers.
They are quite varied. Some are very basic. Some are extremely technical. And there are a bunch in between.
This section provides links to the sites I value most.
Niantic is the maker of Pokémon GO.
They have a bunch of Official sites for Pokémon GO, as well as some general sites that include other work they do.
Sylph Road is a group that analyzes what is going on in with Pokémon GO and tries to share the knowledge.
They have some technical stuff, but they also have a lot of tools and information that is helpful to even amateur trainers.
APK Mirror is a site that keeps the installation files for many Android apps.
In general, when Niantic announces a release, it is available here before it is in the Google Play Store.
NOTE: When you attempt to install APKs you have downloaded, Android requires you to specifically enable the ability to install "apps obtained from unknown sources".
All you have to do is:
There are a lot of Social Groups out there that are constantly talking about the latest issues.
These are some of the best.
There are a number of tools available for use while playing Pokémon GO.
Here are some I use.
NOTE: Some tools violate the Pokémon GO terms and using them is a good way to get yourself banned. These include tools for spoofing your location, or tools that log in as you to access your account.
I am totally against using any tools of that nature.
As far as I know, the ones listed here do not violate the terms.
GoIV is a tool for determining the IV score of your Pokémon.
The thing I like most about it is that it does screen scraping to get what it needs. Here's how it works:
Go to your box, and select your Pokémon. Then, a button shows up on your screen.
It then shows you the possibilities by screen-scraping CP, HP and Level.
When you select the button, it pops up a dialog to allow you to refine the results.
At that point, you select appraisal and GoIV screen-scrapes what the team leader says and fills in the boxes for you.
In the end, you get a full description of what it found out.
And you can set it to copy what it discovered to the clipboard so you can easily paste it to the name.
IV & ToolKit for Pokémon Go is a multipurpose tool that has:
(There is also a "Premium" (pay-for) version with more.)
You can launch the app any time, but it also has a floating icon that allows you to launch the toolkit on top of Pokémon GO. This allows you to see the Pokémon's data while you enter it into the fields.
One of my favorite features is that when you use the IV Calculator and it there isn't a single possible IV, you can scroll down and see how many times you have to power up to narrow down the results. You can also see how many Candies and how much Stardust it will take to get there.
NOTE: Actually, it tells you how many Candies and how much Stardust it would take to max it out. You would have to note the values for the current state, then move up as many levels as you want, then do the math.
I live on the Eastside of the Greater Seattle area.
This page has some resources that are specific to that area.