So, I took CSE 127...

pokecrack.py

#!/usr/bin/env python
# Background: http://cses.ucsd.edu/pokemon/ & http://cseweb.ucsd.edu/classes/fa11/cse127-a/
from urllib import urlopen, urlencode
url = "http://cses.ucsd.edu/pokemon/submitemail.php"
for n in range(1, 1000):
    data = urlencode({"email":"YourUsernameHere@ucsd.edu", "pokemonid":str(n), "submit":"Catch!"})
    f = urlopen(url, data)
    result = f.read()
    f.close()
    print(result) # if you want

# Hopefully this loophole will be closed soon. :-)