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Hau's father either founded Team Skull or was apart of it, either way he disagreed with having to be lead around by the Tapu which made him butt heads with his father, Hala alot, eventually they got into this huge fight right in front of little Hau and the father left Alola, Hala, seeing the cowering child changed his persona to the Hala we know today because he felt bad for how his anger took control of him in that moment and because he feels like his anger is what pushed Hau's father away.
Either way Team Skull was founded by people like the dad who hated being under the nose of the Tapu and openly rebelled against them leading to a crushing befeat when they actually tried to fight the Tapu, particauarlly Tapu Bulu so now Team Skull are nothing but just wash outs who consider themselves the failures of society and either are content in their constant temper tantrum at being shit or actively seek to drag the rest of Alola's citizens down with them.
At least, that's what they were before their repeated losses to trail captains, kantoian trainers and once Guzma, the then leader, disbanded the group.