Entering "nidoran f" and "nidoran m" worked for me, yeah.
151/151 and mewtwo, and the first quiz didn't load for me, either. Clicking the "Start quiz" button does nothing.
I'm getting the impression that you created/helped create this website,
@Wafflecakes. Is that true? If not, whoops, ignore this! If you are running it, though, are you open to a few suggestions? It might be nice if the personality test actually had some text explaining which personality traits are associated with each pokémon result. Like, yeah, cool, I'm mewtwo, but what does that mean? Am I powerful? Am I cold-hearted and constantly angry? What does it mean to be a ho-oh or a doduo? Generally personality tests like these are more interesting if you can actually compare your own personality to the result the test gave you and see whether it's accurate or not, or show your results to your friends and see if they agree with what it says about you, and so on. Just the picture is kind of meaningless by itself! Presumably you had some personality traits in mind when you associated pokémon with certain scores/score ranges during the coding process, so just throwing those in there next to the image would raise the interest level quite a bit!
This looks like it could be a fun set of quizzes with a bit of work (and with the first quiz, y'know, actually loading), maybe with room to expand to more in the future--naming pokémon from other gens, or an option to do it without the pictures and just name as many as you can as fast as you can, or maybe matching ID numbers to pokémon in a random order, quizzes about specific games... lots of potential, and something to check back on in the future to see how it's grown. If you just found this and are sharing it, nice find! And if you created it, it's a good start!