Larvitar won’t appear in Pokémon Sword and Jangmo-o won’t appear in Pokémon Shield during normal gameplay, but you’ll be able to catch them in either version by using these Dynamax Crystals!
You’ll need to reach the Wild Area in the game in order to use a Dynamax Crystal. (This occurs after about two hours of gameplay, though individual gameplay time may vary.)
Using a Dynamax Crystal will make a special Max Raid Battle available in your game. You’ll be able to attempt these Max Raid Battles as many times as it takes to win or until midnight on the day that the Dynamax Crystal was used.
You can only use the code for each Dynamax Crystal in one game and save data. You can’t receive the rewards more than once.
Gifts may become unavailable after a certain amount of time has passed since the release of Pokémon Sword and Pokémon Shield.