A theme of well the 3 lakes this is an older theme I made a while back so I could easily make this better and at some point will re-upload it, but you can tell this theme is heavily focused on piplups evolution and dawn (because I wanted it to and what XD.) But for the top image used credits to: https://static.zerochan.net/Pok%C3%A9mon.Diamond...Pearl.full.2215243.jpg, the bottom image credits to:... I actually found this on a youtube video of a remix;/extended theme of the three lakes from a Youtuber called Jkaeon. The folder icons are taken from Fanpop for the Piplup one and the Empoleon one came from deviant art by StaticxGraphics.

Lake Theme | Pokémon Diamond Pearl Orchestral Remix | DAY 15 - BRSO Christmas Calendar 2018 By Raymusique