No, not in any way. The Hafod Region is an unofficial, fan-made project created for entertainment and creative expression. It is not affiliated with, endorsed by, or associated with Nintendo, Game Freak, or The Pokémon Company. All Pokémon-related trademarks and intellectual property belong to their respective owners. This project is non-commercial, and no profit is being made.
No (sorry).
Yes, all Pokémon found in the Hafod region are unique Pokémon, regional variants and evolutions of existing Pokémon or convergent evolutions of existing Pokémon.
You can read about that here!
Yes, please do! I would like to create an in-universe trading card game, played by the inhabitants of Hafod so any artwork contributed could be used in that project.
Not unless under specific circumstances (contact me if interested).