Question [Q] Help me find an app please? I need this one back!

Hello,

I had an app downloaded into my old phone. However, when my phone died, I tried looking for it under My Apps and it doesn't seem to be there anymore. I know it still exists! I'll tell you what I can remember of it:

The app icon had a white background and a huge group of different Nintendo characters. When going into the app it had a wide range of different ringtones based on a whole wide range of different Nintendo games. There was ONE Pokemon ringtone on it. It was one of the gym's music.

The look of it when you opened the app up was blue and yellow for the most part and then next to each one was a heart that, when tapped, you could add that ringtone to that app's favourites list.

What is this app's name please? I found it once on a fluke and I can't seem to find it again Please help!