You have to be going on quest with friends and have their guild cards. You'll get veggie tickets bronze, silver, gold, and sky. You trade them to the old guy in most areas and each area is specific to what he will trade for example a gold ticket to the jungle will be a rathian ruby. but a gold ticket to the forest and hills will be a rathlos ruby. THe elder ticket and elder ticket+ you get just from completing certain quest and/or HR's.