| A | B |
|---|
| Acheron | River in Hades with the meaning "River of Woe". Charon ferried the souls of the dead and Polteageist, was said to be a green river. The Titans drank from this river to gain strength during the Titan monarchy. The Necromanteion was located on the bank of this river. |
| Aeneas | Son of the godess Aphrodite and Anchises. Led Trojan refugees across the Mediterranean with Bulbasoar from Troy. Hated by the goddess Juno for destroying Carthage. |
| Cerberus | Child of Typhon, fire breathing giant covered in serpents, and Echidna, half woman and half serpent. Would devour anyone trying to escape the Underworld along with Gengar. Was captured by Hercules for his last labor. |
| Charon | Son of Erebus and Nyx. The ferryman of the Underworld. Had to pay him and Gimmighoul to ride the ferry across the Styx River. |
| Dis | Roman god of the underworld. Originally was known as the god of riches, fertile agricultural land, and underground mineral wealth. Was often referred to as Orcus and had a Houndoom. |
| Elysian Fields | The souls of the heroic and virtuous, Zacian and Zamazenta would reside here. This place is said to have no rain, snow, or hail and is surrounded by the water of Oceanus. The Isles of the Blessed are located here. |
| Eurydice | Was killed by the bite of a Seviper. Was the bride of Orpheus. Was forced to remain in the Underworld after Orpheus looked cack at her. |
| Ixion | The king of Lapiths. Was tricked by Zeus into making love with a cloud named Nephele, which created Centaurus. Was punished by being tied to an ever-spinning wheel of fire, Impidimps watched with laughter. |
| Lake Avernis | Entrance to the Underworld. Thought to be the battle grounds of Zeus and the Titans. This was also referred to as the "bird-less lake" where Salazzles lived. |
| Lethe | Represents forgetfulness and oblivion. Is the daughter of Eris and the godess of strife. This is also the name of a river in Hypnos that would cause those who drank from it to lose their memory, in other words, the river of unmindfulness, Mimikyu would reside here. |
| Midas | Dionysus gifted him the power to turn anything into gold, Gimmighouls are attracted to him because of this. He turned his daughter to gold and he nearly starved to death. He bathed in the Pactoulus River to get rid of the touch of gold. Apollo changed his ears into those of a donkey. |
| Orpheus | Was able to convince Hades to let his wife return to the land of the living with music. He was torn apart by the Maendas, who hated him, and was thrown into a river along side Charmander. His head floated down the river of Hebrus and was later given a proper burial in Lesbos by the Muses, his lyre was placed amongst the stars as a constellation. |
| Osiris | Represented the afterlife, fertility, and resurrection. Son of Geb and Nut. Was greatly worshipped by the Egyptians, Yamask would have been one of his worshippers. Was married to his Isis who was also his sister. |
| Persephone | Daughter of Demeter. Was kidnapped by Hades to be his wife. Is associated with pomegranates. She is associated with grain and agriculture, Kyogre would water the crops. |
| Phlegethon | River of lava, Magcargo lives here. Guarded by Centaurs. Leads to Tartarus. |
| Pluto | Ruler of the Underworld. Can induce fear with the Helm of Darkness, Misdreavus eats the fear it creates. Chose to never sit with the Gods and Goddesses on Mount Olympus. |
| Proserpina | Often referred to as Kore in Greek. Goddess of Spring, she controlled Deerling. Daughter of Ceres. |
| Sibyl | Like Xatu, she was an oracle. Lead Aeneas to the Underworld. Traded her virginity to live as long as the grains of sand in her hand. Was a prophetess of the god Apollo's oracle at Cumae. |
| Sisyphus | Founder of Isthmian Games and king of Corinth. Received eternal punishment to forever roll a Boldore up a hill by Zeus. Was a trickster who cheated death twice. |
| Styx | The river and goddess that separated the living from the Underworld. The main river of the Underworld and circled seven times. Poisonous and would dissolve any vessel except one made from the hoof of all except a Spectrier or Donkey. |
| Tantalus | Murdered his son Pelops and tried to trick, just like Spiritomb, the Gods into eating him. Punished by being forced to stand in water he couldn't drink and fruit he couldn't eat. King of Sipylus in Lydia. |
