Darblat is a magical, mystical creature that exists in the Neopets world and is associated with the Haunted Woods. It's not a physical opponent you can fight or interact with directly.
The closest you can get to interacting with Darblat is through the Darblat's Haunted Woods game. This game features Darblat as a mischievous character who enjoys scaring players. You need to find Darblat's hidden treasures within the Haunted Woods to win the game.
So, while you can't physically hit Darblat, you can try to catch him in his game and earn some prizes!