I was fooling around with Pokemon Go and ended up getting a very rare shiny Magikarp. I also wanted to know how hard it was to record the iPhone screen and the sound. There are lots of different ways from both PC and Mac, but I used my Mac Mini and it was very easy:

1. Connect your iPhone or iPad to your Mac via the lightning cable.
2. Open QuickTime player.
3. Click File then select ‘New Movie Recording’
4. A recording window will appear (with you in it, most likely). …
5. Select the Mic of your iPhone if you want to record music/sound effects.
6. Click the Record button.

So, I recorded the evolution from the rare shiny Magikarp to the rare shiny Gyarados. Results were very good: