Igneoid
Source: Pet Battle. An Igneoid is formed when magma makes it to Azeroth's surface and is infused with dark elemental magic. The resulting creature is tiny, fierce, and... Elemental type.
Igneoid is a wild pet formed from magma infused with dark elemental magic, found in Dragonflight zones across Thaldraszus and The Waking Shores.
Guide awaiting review
Locate Igneoid spawns
Search for Igneoid in Thaldraszus at 52.37, 48.77 and 52.53, 47.79, or in a cave at 54, 48. You can also find them in the northern part of The Waking Shores at 51.28, 29.54 near the cliffs. Additional spawns exist in Tyrhold Reservoir around the 43/65 east to 53/59 area.
Reset and capture
Before attempting capture, reset the fight until Igneoid's third ability does not appear, as bad luck during capture could cause it to defeat itself.