mm/assets/xml/objects/object_mastergolon.xml

<Root>
    <!-- Object for the Goron Shopkeeper's animation -->
    <File Name="object_mastergolon" Segment="6">
        <Animation Name="gGoronShopkeeperAnim" Offset="0xFC" /> <!-- Original name is "oF1d_omise" -->
    </File>
</Root>