Only his Magneton is noteworthy it knows the Lock-On/Zap Cannon combo, which matches Chuck's Mind Reader/Dynamicpunch tactic
In a game where you are putting down a lot of permanents, this makes it harder to do and leads to crowded spaces due to having your opponent spread out their cards to avoid Chaos Orb falling on them
When you attack, you get to make two tokens, so its good on offense too
Besides their interaction with the "branded" archetype, Bystials are known for the effect their level 6 monsters share, which allows them to be special-summoned from your hand when you banish a Light or Dark monster from any graveyard in play
Mega Zeraora ex strikes back
It makes 0/1 Wizard tokens that ping opponents whenever you cast noncreature spells, which gives you consistent chip damage