Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_718 ( id number, "pos" text, "rider" text, "manufacturer" text, "time/retired" text, "points" number )

### Question ###
who earned the most points at the 250cc valencian community motorcycle grand prix ?

### Accurate SQL ###

SELECT "rider" FROM table_203_718 ORDER BY "points" DESC LIMIT 1