CREATE TABLE table_203_758 (id DECIMAL, "no." DECIMAL, "dub no." DECIMAL, "english dubbed title / english subbed title\ original japanese title" TEXT, "original air date" TEXT, "english air date" TEXT)

episodes have been dubbed ?
SELECT COUNT(DISTINCT "dub no.") FROM table_203_758
SELECT COUNT(DISTINCT "dub no.") FROM "table_203_758"