If you’ve ever traded Pokémon with a friend or fellow trainer in Pokémon Scarlet and Violet, you’ve probably noticed some Pokémon jump around in the box surrounded by a subtle white glow.
This action means you should trade them (if you don’t mind parting ways with them) because there’s a good reason why—one that benefits the recipient.
Pokémon jumping and glowing in boxes meaning, explained
The reason Pokémon bounce around while being traded is because the trainer you’re trading with does not have that Pokémon registered in their Pokédex. Therefore, if you trade them, you’ll be doing that trainer a huge favor.
The Pokémon you’re trading that bounces around is not a Shiny or rare Pokémon, so it isn’t special in that way. It is special in the way that you are giving the other trainer a Pokémon they don’t have yet!
There is a caveat, though. It only seems to highlight five Pokémon per box. It doesn’t seem to work perfectly all the time, either. Some trainers have reported that it’s not always accurate. Still, its intended purpose is the one mentioned above.
It’s a nifty feature, so it’s a little strange the game doesn’t provide any kind of explanation as to what it means, but observant Pokémon players figured it all out themselves.