|Relatives||Yammonster, Baked Yammonster|
|Appears in||Mother 3|
|Drops||Magic Tart (5%)|
|Vulnerable to||PK Fire, PK Thunder|
|In-battle theme||Back Beat Battle|
- "A rustic combination of a baked yam and a toy helicopter. It grates its body and sends gunk flying."
- — Battle Memory
Grated Yammonsters have the appearance of a light-brown cactus with a propeller-like sprout on the head, striking a taunting pose. The Battle Memory states they are a combination of a baked yam and a toy helicopter, but they are not listed as chimeras.
Like their relatives, they do not roam, but they can rotate 360 degrees to always face the party; they also often guard unopened gift boxes.
Grated Yammonsters have a relatively high HP and Offense. They can cough up phlegm to solidify a target, and also wield PK Freeze β, which can potentially annihilate an unprepared/underleveled party. Their battle theme is the hard-to-combo Back Beat Battle.
Its battle sound is Battle Sound 22 which falls under Code Numbers 502 for regular attack, 503 for Smaaaash! and 504 for Miss.