In Super Adventure Rockman, a Peterchy sits on top of the ceiling and reveals Mega Man's location.
Hits Data Chart
|Mega Man 3|
|Mega Buster||Needle Cannon||Magnet Missile||Gemini Laser||Hard Knuckle||Top Spin||Search Snake||Spark Shock||Shadow Blade|
The Peterchy have a brief cameo in Issue 43, where some were sucked into a reversed dynamo, causing them to detonate and presumably damage the dynamo while Magnet Man is monologuing to himself.