To get a Gold Rathian Egg, you must first make sure your game is updated to 1.5.1. On the title screen, look at the bottom right-hand corner, and it should say Ver. 1.5.1—once you have that, you are good to go.
Interact with any Quest Board in any village, go to Multiplayer and Online Play. Navigate to the Slay Quests tab, and look down the list for the quest (Slay) Gold Rathian. This is a Nine Star quest, so bring with you your best monsties. You can attempt this solo and be given an AI companion to help you. But compared to a real-life person, they are highly inadequate.
Gold Rathian is weak to Thunder, so make sure you have those who can inflict thunder damage, as well as all three attack types. Press Y, Z, or Triangle to change your party and choose your monsties after clicking Edit Party.
Related: All Attack Types Weaknesses and Counters in Monster Hunter Stories 2: Wings of Ruin
Explore the area, and locate Gold Rathian's den. If you don't want to fight anything on your travels, bring along a Nargacuga and use its Stealth monster ability not to get aggroed by any monsters. You'll get to your destination in peace.
See Monster Hunter Stories on AmazonThis Flying Wyvern is no joke to fight. With massively damaging Area of Attack moves and combo single attack moves, you'll be fighting for your life.
Once Gold Rathian is defeated, you can loot the nest for eggs. Due to Gold Rathian being a rare form, the egg pattern has been altered slightly and is extremely hard to find. Use the picture below to know what egg you are after—the egg is yellow with golden lines.
Like usual, walk towards the exit of the den with your prize and make sure the egg is stored. Then go and hatch it to see if you were lucky enough to get Gold Rathian as a Monstie. If not, rinse and repeat.
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