Tainted Moth
Source: Pet Battle. Prefers to dwell in corrupted woodlands and feed on Purple Lotus nectar. Flying type. If you catch one of these as a secondary pet (who assists the pet you challenged), he will change colour every time you summon him.
The Tainted Moth is a wild pet found in Felwood that can appear as a secondary pet joining battles against other creatures in the area.
Guide awaiting review
Travel to Felwood
Head to Felwood on Kalimdor, where the Tainted Moth has limited spawn points but can appear as the second pet to join a battle against local critters.
Start battles with local pets
Engage Tainted Cockroaches, Tainted Rats, or Toads in pet battles using level 20 pets — the Tainted Moth can show up as the secondary assist pet in these fights.
Forfeit if Moth absent
If the Tainted Moth does not appear as the assist pet, forfeit the battle and start a new one until it joins.
Capture carefully at low health
Reduce the Tainted Moth's health carefully before capturing, as it can take unexpectedly high damage and be killed before the capture goes through.
Tips
If you catch a Tainted Moth as a secondary assist pet rather than the primary target, it will change colour each time you summon it.
Rare quality Tainted Moths have stats of 919 health, 155 power, and 146 speed — with speed effectively at 218 in combat due to the flying pet bonus.
