1. Gain Friendship:
- Spend time with your Sneasel in your party and interact with it frequently.
- You can feed it Berries, use it in battles, and interact with it in various ways to increase its friendship.
- Talk to the NPC in any Pokémon Center who'll evaluate your friendship level with your Pokémon. Check with them regularly to track your progress.
2. Level Up at Night:
- Once Sneasel's friendship level is high enough, it will evolve when it levels up.
- Make sure to level it up at night time. You can either wait for nighttime to occur naturally, or you can change the Nintendo Switch system's date and time settings to night.
3. Evolution:
- When you level up Sneasel while its friendship level is high enough and it's nighttime, it will evolve into Weavile.
Remember, you don't need to use a specific item like the Moon Stone for Sneasel to evolve. Just follow the steps above, and you'll be able to obtain Weavile.