SELECT T2.Shop_Name FROM stock AS T1 JOIN shop AS T2 ON T1.Shop_ID  =  T2.Shop_ID GROUP BY T1.Shop_ID ORDER BY SUM(T1.quantity) DESC LIMIT 1
Show the name of the shop that have the largest quantity of devices in stock.
[Schema (values) (types)]: | device |  device : device_id (text) , device (number) , carrier (text) , package_version (text) , applications (text) , software_platform (text) | shop : shop_id (text) , shop_name (number) , location (text) , open_date (text) , open_year (text) | stock : shop_id (text) , device_id (number) , quantity (text);