The Swedish Embassy does not legalize or issue Apostille on Swedish documents.
Legalisation on Swedish documents are issued by the Ministry for Foreign Affairs in Stockholm. For more information please visit the website of Ministry for Foreign Affairs legalisations - Government.se
Apostille on a Swedish document can only be issued by a Notarius Publicus in Sweden. More information and contacts to a Notary Public in Stockholm can be found on the County Administrative Board website. From the website you may also find Notaries in other parts of Sweden.