If you're not going to do a neutral route, at least watch the neutral Undyne fight. (Caution: major spoilers)
https://youtu.be/tpR_mvYUI8U?si=QjtNvx_Zv7jESb0W
"We live in a country Hasire.." ~ yosouf06
REVOLVER STAKE! http://img.photobucket.com/albums/v717/ChocoboMog123/AltEisenRChocoboMog.png