Mesprit locations — where to catch

In Hisui (Legends: Arceus)

• Verity Cavern — Static Encounter

In Sinnoh (Diamond, Pearl & Platinum)

• Roaming Sinnoh — Roaming

Other games (6)

• Brilliant Diamond / Shining Pearl (Gen 8): Roaming Sinnoh, Sinnoh
• Sword / Shield — The Isle of Armor (Gen 8): Max Lair
• Ultra Sun / Ultra Moon (Gen 7): Ultra Space Wilds, Ultra Space
• Omega Ruby / Alpha Sapphire (Gen 6): Nameless Cavern
• Black 2 / White 2 (Gen 5): Celestial Tower
• Diamond / Pearl / Platinum (Gen 4): Sinnoh

Mesprit — full Pokédex entry