From the source:
 
Next pairing from the set with all my Next Generation canon couples! Featuring Pandemonium x Harmony.  
Pan’s determination to become a free spirit and Harmony’s resolve to grow a strong health and be her own person was a major influence on their relationship and it brought them closer together over the years until they started dating officially.  
Together they are a very carefree couple, with a burning passion to explore new places and meet new people, species of critters and flora. Unlike their young and confined selves they are not afraid to take risks and try new things as long as they do it together. Their mutual trust for each other is inspiring for many others.
 
Here’s some fun facts about Harmony. She may not know how to fly but she’s a great runner and swimmer. These are two qualities that she and Windy Belle don’t share. And she can hold her breath underwater for over a minute, no one else in the Next Gen can hold that long.
 
And a small fact about Pan. You see those scars on his chest? They were caused by an accidental Chaos Magic outburst from Radiance when Pan was trying to help her calm down.