The Livecycle Mobile ES3 is like your workspace, with that you can see task assigned to you and you can approve or reject them, for that you need to require to connect to livecycle server. Livecycle Mobile ES3 works only with livecycle server. But as per your requirement, Livecycle Mobile ES3 is not required. Just download adobe reader for mobile and open your form.
Thanks for your reply that answers my question.
with Acrobat Pro (not Standard) you also have LiveCycle Designer, which is a member of the the LiveCycle family and allows creation of static and dynamic XFA forms.
Those forms are generally designed to run at client side, so you don't need any LC server.
But, with the current state of PDF viewers for Android (and iOS) you wont be able to use such form on those devices, cause XFA is not supported.