Soon you would be able to trade Pokémon cards while you’re on the go as the iPad app has appeared during the World Championship. The game has been shown to several participants and while the official Pokemon company has yet to mention any dates, it is said to be released later of this year.
The Trading Card Game does look like direct port from the desktop version which is currently available. When it gets released for the iPad, it is likely to be free to play and in-game purchase. For those with the real physical cards, it is likely that you are able to import them into your virtual deck