Use this list: http://bmgf.bulbagarden.net/f395/ultra-dex-gen-v-90303/
As you may or may not know, the URPG is hosted on 3 forums and each has different rules and limits. Here on PE2K, the URPG has run into a problem with the character count limit in place. It's much smaller than the other 2 forums so the staff decided to take the list off of here and reference the others.
Hopefully my explanation is clear enough. It's not my strong suit lol.