Long ago, a mere decade or two after the Ancient Wizards established themselves and formed alliances with the other races found in Magia, they decided to build a grand structure as a monument to their alliance.
The new Four Founders were a Witch, a Wizard, a Dwarf and a Goblin, each with their own Pokemon companions that became the mascots for each house. They kept the old names to pay homage to the original Hogwarts, and the fact they all exemplified the same personality traits.
Gryffindor- Hadronlir Goldaxe, the Dwarf
Hufflepuff- Melusina Hallewell, the Witch
Ravenclaw- Gonxa Rarliort, the Goblin
Slytherin- Devin Sephiran, the Wizard
They made sure to keep the original history while making their own
New Hogwarts was a joint effort between all the races of Magia. The plans drawn up by wizards, modified and financed by the goblins, built primarily by the dwarves, and supported by the various Pokemon.
It was given Gabharleon and Aqbanor’s blessing before they disappeared.