So I started another play through of this cause only using 3 mons is saddening. I decided to use a Salpoid to cover my water type. I caught one that was level 24 at 8:30pm CST, which is night in game. I leveled it up once and it didn't evolve. I leveled it to 26 just to double check, still no dice. I don't know if this is a bug or day/night evos just dont work, but I thought I would point it out.