Pokémon Soulsilver Hardcore Nuzlocke - Dark Types Only!

Can I beat a Pokemon Hardcore Nuzlocke challenge in Heartgold and Soulsilver using only Dark types? Nuzlocke rules: -Fainted Pokemon must be permanently boxed -Only the first encounter on any given route may be caught (dupes clause) -All pokemon must be nicknamed Hardcore Rules: -Always Set mode -No items from the bag option in battle (held items are ok) -No overleveling the next gym leader #pokemon #nuzlocke #challenge