Use Hikashop->Configuration->Display->Views to edit product->show_default
For the code you need:
echo $this->element->product_code;
For the brand I do not think there is a variable set for you to return (I am sure someone will correct me if I am wrong), but you could use SQL in the same file. Something like:
$db =& JFactory::getDBO();
$query = 'select category_name from '.hikashop_table('category').' where category_id = '.$this->element->product_manufacturer_id;
$db->setQuery($query);
$brand = $db->loadResult();
echo $brand;
I hope that helps.