CREATE TABLE table_203_718 (id DECIMAL, "pos" TEXT, "rider" TEXT, "manufacturer" TEXT, "time/retired" TEXT, "points" DECIMAL)

who earned the most points at the 250cc valencian community motorcycle grand prix ?
SELECT "rider" FROM table_203_718 ORDER BY "points" DESC LIMIT 1
SELECT "rider" FROM "table_203_718" ORDER BY "points" DESC NULLS LAST LIMIT 1