- I try to always bring the following items into a dungeon with me: 2-3 Apples, 2-3 Oran Berries, a Max Ether/Elixir, a status recovery berry/seed, and depending on the dungeon a resurrection seed and Escape Orb. They're not required items by any stretch, but I always like to keep things safe.
- Once you're freely able to enter dungeons, you can set your partner AI to focus on following you, gathering items, etc. Make sure to edit that in the pause menu so you're not shocked when they rush towards an enemy.
- Certain Pokemon in dungeons are able to go through walls/cross lava/water, and depending on the angle this means your attacks will miss if they aren't projectiles, so be wary of your surroundings at all times.
- Blast Seeds are your friend when it comes to bosses.