I've tried TCG one and PlayTCG, but they're very slow and I can't get the latter to work properly. Is the official one the best?
There is a official TCG simulator by the name of Pokemon Trading Card Game Online for PC and IPad. The game is currently in its beta phase, but it is free as well as stable. Source: http://bulbapedia.bulbagarden.net/wiki/Pokémon_Trading_Card_Game_Online
