Lake Verity (Japanese: シンジ湖Shinji Lake) is a location in the Sinnohregion, and part of the Obsidian Fieldlands in the Hisui region. At the center of the lake, there is a cave that is named Verity Cavern, which is home to the Legendary PokémonMesprit, the guardian of the lake and the Being of Emotion.
In The Needs of the Three!, it was explained that Lake Verity, and indeed all three of Sinnoh's lakes, are the entrances to another world where the lake guardians reside, and they do not actually live in the lakes themselves. Later, a pink whirlpool appeared in the lake due to Pokémon Hunter J dropping the Galactic Bomb into Lake Valor. From this portal emerged Mesprit, who quickly teleported away to Lake Valor. This was witnessed by Professor Rowan and his assistants.
Lake Verity appeared in a flashback in The Rival. Lucas and Barry were attacked by a pair of wild Starly there, but they were able to fend them off using Pokémon they found from a briefcase, with Lucas choosing Chimchar and Barry picking Piplup.
After the battle between the player and the wild Starly in Pokémon Diamond and Pearl, a square of tall grass can be seen to have disappeared when the player and their friend walk out of the tall grass. It is where the briefcase which was taken away by Dawn/Lucas was originally. The square remains in Pokémon Platinum even though the same event did not occur in the game.
Lake Verity's Japanese name shares the same Japanese name of Paul.
In the anime, Lake Verity is much smaller than its game counterpart and the other lakes in anime, resembling more of a large pond.
In the scripted battle against a wild Starly, if the player's Pokémon's HP becomes low enough that its HP bar turns red, the wild Starly will flee. This attempts to prevent the player from losing the battle. In Pokémon Diamond and Pearl only, both Pokémon are also prevented from scoring critical hits.
If the player's starter Pokémon faints in this battle (which is possible if the player's Pokémon takes enough damage to knock it out while its HP bar is still yellow), the game will freeze.
At the beginning of the game, the water level is too low to surf. After the events of Lake Valor, the water level rises due to Mesprit coming out of hiding, allowing the player to surf.
Verity means "truth", possibly derived from Japanese 真実 shinjitsu (truth). This is related to Mesprit's status as the Emotion Pokémon, as the truth often conveys strong emotions.
Shinji is derived from 心情 shinjō (emotions), as indicated by a signpost in Brilliant Diamond and Shining Pearl that provided an annotation of its name fully written in kanji as 心情湖.