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I was able to run Unity Remote 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build Settings - add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for yourself.

Note2: I have not tested this solution with other emulators like: Nox App Player or Genymotion.

I was able to run Unity Remote 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build Settings - add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for yourself.

Note2: I have not tested this solution with other emulators like: Nox App Player or Genymotion.

Note3: Using emulator may be very laggy.

I was able to run Unity Remote 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build Settings - add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for yourself.

I was able to run Unity Remote 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build Settings - add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for yourself.

Note2: I have not tested this solution with other emulators like: Nox App Player or Genymotion.

I was able to run Unity Editor 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build - setup add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for Yourself.

I was able to run Unity Remote 4 on standard Android emulator.

Final efect looks something like

Whole procedure:

1. Install Unity and open some Unity tutorial project (2D Roguelike tutorial in my case)
2. Install JDK, Android SDK and setup Android emulator using AVD Manager. My emulator config looks like this:

Important note: CPU/ABI option seems to be one of most important ones(Intel x86 emulator didn't work for me)

3. Then install Unity Remote 4 from apk file to emulator using command: adb.exe install path/to/apk (Windows) or adb install path/to/apk (Linux/Mac).
4. Then in Edit > Preferences > External Tools - set paths to Android SDK and JDK
5. In Edit > Project Settings > Editor in section Unity Remote select: Any Android Device.
6. In File > Build Settings - add Your scenes and switch platform to Android.
7. Press PLAY in Unity while Android Emulator is running and Unity Remote 4 app is opened.

Tip: At first I needed to restart unity after all changes, because it wasn't starting game on emulator. Now it runs everytime.

Note: My emulator config was only for test purposes, so You can find better config for yourself.