Pokémon Diamond and Pearl/Wayward Cave

Right Side of Wayward Cave
This is a very large cave, and therefore is easy to get lost in. It is recommended that you get your Pokémon leveled up to mid-30's, because there are lots of wild Pokémon and trainers to fight. Trainers' Pokémon are around level 18-20.

Also, if you get sick of battling wild Pokémon, it is recommended that you bring along about 30 Repels, 15-20 Super Repels, or 10 Max Repels if you plan on visiting the whole cave. Also, you will want a Pokémon that knows Flash, as the cave is dark and it is nearly impossible to get through in the dark. You will also need a Pokémon that knows Rock Smash, as there will be several breakable rocks in your way.

In the northeastern-most corner of the cave you will meet a young lady named Mira and have to escort her back to the entrance. In return, she will heal you after every fight. She may also appear as a partner in the Multi Player part of the Battle Tower. Her one Pokémon in the cave is a level 18 Kadabra.

Items

 * Escape Rope
 * TM32 (Double Team)
 * Rare Candy
 * burn heals(hidden)

Left Side of Wayward Cave (Hidden)
Under the Cycling Road there is a little grotto that is hidden, allowing access to a second and extra side of Wayward Cave.

A Pokémon with Strength is needed, and some sort of repellent (Max Repels and a high level Pokémon work best). A bike is needed for most of this "maze". To jump ramps with the bike, you need to have the bike in 4th gear.

This is the only place in the game where you can catch a Gible

Items

 * TM26 (Earthquake)
 * Max Ether
 * Revive
 * Grip Claw