1. You Don't Have the Razor Claw:
* This is the most common reason! Sneasel *needs* the Razor Claw held to evolve into Weavile. Make sure you have it in your inventory, and equip it to your Sneasel.
2. You're Not Trading:
* Sneasel's evolution is tied to trading. It needs to be traded to someone else, holding the Razor Claw, to evolve. Even if you trade it back to yourself, it should evolve.
* Important Note: This only works with the Razor Claw. Sneasel will not evolve if you try to trade it without the item.
3. You're Trying to Trade it to a Certain Trainer:
* Sometimes, players believe you need to trade Sneasel to a specific trainer to make it evolve. This is not the case! Any trainer will do, even yourself.
4. You're at the Wrong Time of Day:
* Sneasel's evolution isn't affected by the time of day in SoulSilver. So, you can trade it whenever you like.
Troubleshooting:
1. Double-Check Your Razor Claw: Make sure you have it and that it's equipped on Sneasel.
2. Trade and Trade Back: Trade your Sneasel to someone else (even yourself!), and it should evolve.
Let me know if you've done all these things and are still having trouble, and we can try to figure out what's going on!