>>54472181The map blurbs present when they scatter around Kitakami as Titan Pokemon offer brief folklore that basically describes them as ordinary Pokemon who completely lack the traits that they became famous for, but greatly desired to achieve them.
If they truly are the king's retainers, it's entirely possible he could have manipulated them into joining his side by promising to grant them what they sought. Of course, this was achieved through the Toxic Chains they all wear, which presumably caused the trio to become just as vile as him.
