House PierrotThe largest ruling House in Sinnoh and the chief protectors of the region. Currently, they hold four Gyms, two Elite Four positions, and are the house of the current League Champion. Leader: Lord Byron Pierrot
Knight class: Earth
Colors: Green and silver
Territory: Oreburgh City, Jubilife City, Eterna City, Eterna Forest, Celestic Town, Canalave City, Iron Island, Mt. Coronet
- Animal Motifs: Their mascot is a Steelix — steadfast, stalwart and strong.
- Arch-Enemy: Their infamous long-running feud with House Tantibus has led to dozens of minor kerfuffles and at least one full-out war. As of the later generation, they seem to be taking steps to ease tensions in the wake of Tantibus's Heel-Face Turn.
- Destructive Savior: Given that they have Super Strength as their hat, this happens more often than they would like to admit.
- Expy: Very much like House Gryffindor, though their reputation for taking in Knights rejected by other Houses is more reminiscent of Hufflepuff. Ironically, their colors are identical to those of its greatest enemy, Slytherin.
- Fantastic Racism: Downplayed. While not nearly to the level of their rivals House Tantibus, they can be rather condescending to the non-Earth Knights they train, often .
- Idiot Hero: If they see someone in trouble, they'll instantly jump in to help...even if they don't know what they're doing. A common saying among the other Houses is, "A Pierrot's heart is bigger than his brain."
- Super Strength: 70% of their members are Earth Knights, who are famous for this trope.