I searched via Google and I found one thing so I can play Dueling Network in iPad. I started play YU-GI-OH again a while ago, it's awesome XD
Well, I sometimes play because of the moe artwork though :3
Well, to play this in iPad, I use this program called "AlwaysOnPC"
You can purchase it here : http://www.alwaysonpc.com/ (or just shout 'Yo-Ho-Ho I'm a Pirate' and do what you usually do)
Well, though there're some annoying stuffs...
1. I can't edit or create new deck, dunno how to click and drag using this
2. If you're not using USA / Europe internet connection, there'll be some delays to the command.