Can you get a four way hatstall on Pottermore?

Answer 1

No. If you think about it, Gryffindor and Hufflepuff are very alike - both value good behaviours and something more than achievement (they value bravery, chivalry, loyalty, trust, justice). Slytherin and Ravenclaw are alike, as they both value achievement over proper social behaviours (they value ambition and academic excellence)

This is not to say that Gryffindor students do not have ambitions or that Raveclaw students are disloyal. However as the four houses are vastly different, you can generally only have a hatstall between G and H, or R and S (since these are houses with similar qualities)