CREATE TABLE table_name_63 (name VARCHAR(255), region VARCHAR(255), date_of_reclassification VARCHAR(255))
WHose Name has a Region of kansai on 2012-04-01 ( core city )?
    
SQL: SELECT name FROM table_name_63 WHERE region = "kansai" AND date_of_reclassification = "2012-04-01 ( core city )"