What do the blue orbs on Gyms mean in Pokemon GO?

The Season of GO has finally arrived in Pokemon GO. With it comes the first major content update to the game: Ultra Beasts.

How to level up in Pokémon GO - Quora

Pokémon Go Shadow Raids, including how Shadow Raids work, enraged Pokémon and Shadow Raid restrictions

What do the blue orbs on Gyms mean in Pokemon GO?

What does the blue glow behind a Pokémon mean in Pokémon GO? - Quora

How to battle in gyms in Pokémon GO

Latest Pokemon GO datamine leaks GO Fest texts and details

Is this supposed to be red or just some random trainer? : r/PokemonScarletViolet

pokemon go - Why is the gym icon color on my Pokémon different than my current team? - Arqade

Sapphire

You fool! I gave you that Toxic Orb for a reason! : r/pokemon

Pokemon Go Tour: Hoenn - Global Event Guide and All Research Tasks - Pokemon GO Guide - IGN