Nintendo and Game Freak gave us a look at what the Pokemon series has to offer for the rest of the year with the latest Pokemon Presents showcase, which included a close look at both of Scarlet & Violet's upcoming DLC expansions. The Teal Mask and The Indigo Disk will introduce new characters to meet, trainers to battle, and Pokemon to catch, though the quality of the expansions wasn't one of the main talking points now that the dust has settled.
Instead, the show has come under fire for seemingly using a piece of fan-made music without permission for one of the DLC trailers. ND Music posted a musical arrangement of Pokemon Scarlet & Violet's Area Zero theme over 8 months ago, and the similarities between the piece of music and the snippet in the game's trailer are pretty damning.
Thankfully, ND Music isn't too upset that their arrangement seems to have been used, as they're actually just "really surprised and quite honored" instead. However, they also wish that The Pokemon Company would've simply asked them before the show if they could use it, something which seems to be the main area of contention with fans. You can also find a more direct comparison down below posted by Twitter user Lewchube so you can judge for yourself.
In terms of legality, there's nothing really stopping Nintendo from doing this with any unofficial arrangements that fans make. ND Music's arrangement is their own original work that has been transcribed from the game's score by ear, but it being a cover still puts it in a grey area that more than likely clears Nintendo of any legal wrongdoing.
That doesn't mean it's morally okay though, as there are thousands of fans in agreement that Nintendo or The Pokemon Company should have at least credited ND Music somewhere if it has used their music in the expansion's trailer.
It's also possible that whoever made the trailer could have just accidentally lifted the song from YouTube thinking it was official, and that the whole thing is just a big mistake. It seems very unlikely that Nintendo would resort to pinching fan arrangements when it has the original music readily available. Either way, it's not a great look for a company that's already being given dirty looks from its fanbase.