Jewel

Jewel, as he is referred to by Miss Magius, is a selfish Sableye. He is highly fascinated with treasures and valuable things of all kinds. This lust goes so far as to make him incredibly protective of his possessions, hiding them away to prevent even those he trusts from reaching them. He also has a persistent habit of hissing whenever he speaking the 's' sound (s, ce, etc.).

History
Prior to his death, Jewel was a notorious pirate and treasure hunter known as Jonathan Seelhound. He plundered the shores of the Hoenn region often while looking for treasure. However, he died at the age of 46 when a man stabbed him in the stomach with a sword.

Jonathan was reborn as a Sableye, with no memory of his life as a human. What remained consistent, however, was his lust for treasure. Early as a Sableye, he made the area of Dewford his home, since he seemed to lack the ability of some other ghosts to disappear.

Eventually, a Misdreavus took interest in Jewel, since he was a ghost type Pokémon yet seemed to be solid. Jewel spotted the necklace the Misdreavus was wearing, so he stole it from her, not knowing she needed the necklace to sustain herself with the fear of others. He returned the necklace to a now considerably weak Misdreavus and offered his apologies.

Some time later, Jewel showed Dreavus his collection of various stones, including a Dusk Stone. He was particularly fond of the Dusk Stone, and insisted that she feel the stone for herself. Of course, this resulted in her evolving into a Mismagius, and caused the stone to disappear. Jewel attacked Magius for stealing his stone, but she managed to defeat him. Jewel's mistrust of Magius continued until she offered compensation in the form of a large pearl.

Jewel at some point began to mistrust the Mawile living in Granite Cave, so he decided to relocate most of his treasures to an island cave north of Dewford Island. To do this, he used a technique known as Shadow Sneak that Magius had taught him before to travel across the water. He continues to use this technique to terrorize humans and Pokémon from farther away.

He has allowed Magius to create illusions for him twice. The first time he was a Makuhita, and the second time he was an Arbok.

Currently, Jewel is living in a strange, ghostly house. He has hidden a handful of his treasures throughout the house to make himself feel at home.

Trivia
"DiamondGlare" refers to a Sableye's eyes looking like diamonds.