Mr. Windychu and Ms. Wavychu
As we know the trailer for WIWA featured these two pikachus wearing costumes which i believe are named Mr. Windychu and Ms. Wavychu. Here's what I think they symbolize: in the beginning of the video at 0:50, the camera shows the person (i.e. the player in this case or the watcher of the video) looking at a drawing of a pikachu looking out at the ocean from a plank, and an undressed pikachu walks upto them and smiles. In the very next frame, the person opens a door and it opens onto a plank overlooking the ocean, very similar to the same scene depicted in the drawing. However, immediately after that, the dressed pikachus are introduced. I think it hints at a new feature of being able to dress up ur pokemon (beyond the partner outfits of lets go), as the transition (depicted by the opening of the door) from a naked pikachu overlooking the ocean to two clothed pikachus doing something similar could hint to that. The costumes worn by these pikachus could be version exclusive costumes which match the trainer (as the male and female trainers wear similar costumes later in the video) and could also be a gift pokemon given to us in each version to kick start the idea of dressing up pokemon, kinda how korrina's lucario showed mega evolution in XY
