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|Mostly Bad Fly|
|Relatives||No Good Fly|
|Vulnerable to||PSI Fire, PSI Freeze|
|Location||Grapefruit Falls, near Saturn Valley Belch's Factory|
The Mostly Bad Fly is an enemy appearing in Earthbound. They are the stronger counterpart of the No Good Fly, and like many other bug enemies, they are extremely vulnerable to Insecticide Spray. They use the theme "Battle Against Belch."