For any that don't know, the battle spot special for season 14 of battle spot is VGC 16. I used the EXACT same team I used on showdown, yet it won't let me participate! The Pokemon also all have the blue pentagon, so I'm confused.
Your Pokemon are ineligable or you aren't using a legal team. Maybe your moves are illegitimate or you made a mistake. I can give a better answer if you provide more info. Aside from that, maybe you didn't register properly?