Pokemon-go – Does the Pikachu event hat have any effect

I saw a few questions like these. I did a lot of research myself to see how I could fix the problem, and this trick did it, so I thought I'd add my two cents, and so this can also help future readers.

Why is Pokemon Go not Working on WiFi?

At the first launch of the app, a setting must have been selected automatically that restricts data access to the Pokemon go app.

How to fix the problem

Go to:

1. Settings of the phone
2. Go to the apps section of your settings
3. Click on "reset app preferences" in that section (for my Galaxy S7 I click the three dots at the top right of the screen first)
4. Launch Pokemon Go

More on resetting app preferences in this article by TechRepublic.

Downfalls

This will reset the app preferences for every app, which means that when you launch an app, it will again ask you a prompt for access to a certain feature on your phone. For example, Gallery will ask for permission to your photos the next time you open it, just like Pokemon Go will ask for permission to your camera.

Any current progress you have towards a candy will be removed when you switch buddy Pokémon. But, if you walk 10km with Pikachu, switch your buddy, and then put Pikachu back as your buddy, it will still be on your shoulder, and the total distance will be the same as it was before the swap.

IMPORTANT: This does not apply for all Pikachu. I have one Pikachu who has been my buddy for 15.5km, but when I put my other Pikachu as my buddy, the total distance walked was "0.0km". In the same way, 1km walked with a Pidgey or Squirtle will not be added to your total distance walked for all Pidgey or Squirtle.

So the total distance is kept whether or not the Pokémon is your buddy, but does not apply for all of the same Pokémon. Hope this was helpful.