if u get far in the game rescue smergle from howling forest, and he will join your team hes lv 5 then go to his freind area and talk to him, he will decorate your flag if you want him too, if you do do a dungeon or a rescue mission and go back to your team base, and your flag desine will be different than before.
(NOTE)
can only be done after unlocking friend area sky blue plains,and after you stoped fallen star collosin,my flag desine is a pokeball ,o yea i all most forgot i started a new game and got charmander again an pikacu as a partner,and my team name is now team spit fire.