Pokemon Battle field is only a mode for ygopro in order to allow players to duel with Pokemon cards. The rules of this game i afraid have not any deal with Pokemon online TCG.
So that means that this game have different rules that Pokemon online TCG and also this game have not retreats but have a new skill called support in order some Pokemon are
able to use their abilities from your hand. Unfortunately because this is only the demo version there is not any tutorial to explain how to play it and the only way to get an idea how these duels work
is to watch the available replay and of course to try a duel for yourself or with your friend help using Lan and only!! Anyway if you interesting about this mode you can download it here: 

http://www.ygopro.co/tabid/95/g/posts/t/4200/Pokemon-Battle-Field-Beta-version-Demo.aspx





I hope you like it guys!!