Final answer:
To catch Tyranitar in Pokémon Sword, you can either evolve a Larvitar or Pupitar or find Tyranitar directly in the Wild Area during a sandstorm or participate in Raid Battles featuring Tyranitar. You need to be prepared with appropriate Poké Balls due to its difficulty to catch.
Step-by-step explanation:
To catch Tyranitar in Pokémon Sword, you need to reach the latter stages of the game as it is a powerful evolved form that doesn't appear early on. One method is to evolve a Larvitar or Pupitar, which you can catch in the Wild Area or through Raid Battles. Larvitar evolves into Pupitar at level 30, and then Pupitar evolves into Tyranitar at level 55.
Another method is to find Tyranitar directly in the Wild Area during specific weather conditions, like a sandstorm, which generally appear in more challenging areas of the Wild Area. Keep your eyes on weather patterns, and also look out for Raid Battles that feature Tyranitar. Participating in these battles gives you an opportunity to catch it upon victory. Remember to bring powerful and suitable Poké Balls because Tyranitar is difficult to catch.