Open google wallet and get your ST up, click the three dots in the top right, then select remove.
Open the browser on your phone and go to your ticketing account:
you will see 'welcome' 'tickets' and 'season tickets'
click the season tickets one
it should then allow you to tick your season ticket and download it to your mobile.
it should open in a google wallet webpage, make sure you are signed in to the correct gmail account and select the 'save to wallet' or 'add to wallet' or whatever it shows so it goes in to your wallet app.
and to answer the first question, I don't think anyone has a physical Season Card anymore. One of our group doesn't have a smart phone and he has to print at home for every game.