If you’re on Android and still playing Pokemon Go, you might want to check if your device supports ARCore (Google’s AR kit). The game now supports AR+ mode, which scales the pocket monsters to their accurate dimensions as you move closer or farther to them. This mode also makes it easier for them to detect your movement, so you need to get close before you can throw that Poke Ball. Again, as we mentioned, this will only work if you have ARCore. And that is something you can download on the Play Store—if your device supports it.
Source: Nintendo Life