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 sayVer. 1.5.1—onceyou have that, you are good to go.
Interact with anyQuest Boardin any village, go toMultiplayerandOnline Play. Navigate to theSlay Queststab, 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 toThunder, 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.
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Explore the area, and locate Gold Rathian’s den. If you don’t want to fight anything on your travels, bring along aNargacuga and use its Stealth monster abilitynot to get aggroed by any monsters. You’ll get to your destination in peace.
This 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 may 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—theegg is yellow with golden lines.
Like usual, walk towards the exit of the den with your prize and verify 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.