Spheres are used in evolving a normal pet with at least level 50 and can be found in the locations listed below, or purchased from the shop using gems.
For evolution of dragons, or pets at higher levels, refer to the relevant Evolution Items.
Earth Sphere
Can be found at these NPC's:
Mummy king (Desert Isle)
Earth Dragon (Desert Isle)
Elder Treant (Wind Palace)
Jewel Gangster (Metalpolis)
Blue Thunder (Metalpolis)
Kappa (Atlantis)
Demeter (Atlantis)
Merpeople (Atlantis)
Saga (Atlantis)
Gnawl Fighter (Fire isle)
Wind Sphere
Can be found at these NPC's:
Filthy Foot (Wind Palace)
Diamond Gangster (Metalpolis)
Betrayal (Metalpolis)
Amphitrite (Atlantis)
Arielis (Atlantis)
Poseidon (Atlantis)
Wind Dragon (Wind Palace)
Lightning Sphere
Can be found at these NPC's:
Shadow C (Desert Isle)
Gold Gangster (Metalpolis)
Mrs Stoneheart (Metalpolis)
Pirate (Atlantis)
Saga (Atlantis)
Demiguise (Atlantis)
Garm (Fire Isle)
Gnawl Captain (Fire Isle)
Vampire Lord (Fire Isle)
Water Sphere
Can be found at these NPC's:
Oak Treant (Wind Palace)
Metal Maniac (Metapolis)
Garp (Atlantis)
Darkfire (Fire Isle)
Elite Gnawl (Fire Isle)
Fire Sphere
Can be found at these NPC's:
Shadow A (Desert Isle)
Harpy (Wind Palace)
Eagle-Eye (Wind Palace)
Gold Gangster (Metalpolis)
Sekly (Atlantis)
Gnawl Captain (Fire Isle)
Elite Garm (Fire Isle)
Pyro Dragon (Fire Isle)