Sinnoh is full of hidden items and daily events that can provide valuable resources:
- Hidden Items: Use the Dowsing Machine Pokétch app (obtained from Dawn/Lucas on Route 207) to find invisible items scattered across the region. Many valuable items, including Rare Candies, TMs, and evolutionary stones, are hidden.
- Berry Patches: Plant berries in various patches across Sinnoh. They grow over time and can be harvested for use in battle, Poffins, or selling.
- Daily Swarms: After obtaining the National Pokédex, talk to Dawn/Lucas's sister in Sandgem Town. She'll tell you about a Pokémon swarm on a specific route, allowing you to catch Pokémon not normally found in Sinnoh.
- Daily Lottery: In Jubilife City, visit the TV Station and participate in the daily lottery. If your Trainer ID matches the winning number, you can win prizes.
- Massage Girl: In Veilstone City, a woman will massage one of your Pokémon daily, increasing its happiness.
- Ribbon Syndicate: In the Resort Area (post-game), you can join the Ribbon Syndicate if one of your Pokémon has 10 or more Ribbons. This grants access to exclusive items.
Regularly checking for these events and using your Dowsing Machine can provide a steady stream of useful items and unique Pokémon.