Is it an original song? I've been wondering what that song was. Please find out what song it is. Thanks in advanced.
Hi Metroid, I'm just a little late in answering this question but I found out it was still unanswered.
The name of the song that plays in the Pokemon Let's Go Pikachu/ Eevee Trailer is called Heart of Gold - Neil Young
And that brings the case to a close! Hope I helped.