Pokémon Diamond and Pearl/Route 214

The person in the gatehouse on the Veilstone City side mentions this place as a "mess". However, there are some things to look around here for, as well as many trainers to fight.

Trainers

 * Collector Douglas


 * Ruin Maniac Hunter


 * Collector Jamal


 * Ruin Maniac Bryan


 * Psychic Mitchell


 * Beauty Devon


 * Collector Brady


 * P.I. Carlos


 * Psychic Abigail

Items

 * Max Potion
 * Big Root
 * Heart Scale (hidden)
 * Guard Spec.
 * TinyMushroom (hidden)
 * Honey (hidden)
 * Rare Candy requires HM03 Surf

Ruin Maniac Cave
A Ruin Maniac is digging away in the mountain. Pick up TM28 (Dig) and talk to him. He proposes a contest where you catch Unown and he digs away. Catch 10 different kinds of Unown to find the tunnel much longer, and catch all 26 to discover he has plunged through into Solaceon Town and into a room with the last two Unown, ! and ?.

Items

 * TM 28: Dig