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Midday Lycanrock is tan with blue eyes, standard wolf. Represents early part of the day.
Dusk Lycanrock is darker and getting closer in color and look to Midnight Lycanrock. Looks more feral, eyes turn red during its animations. It bridges the gap between the two forms. Represents the moments between day and night.
Midnight Lycanrock is basically the wolfman, a bipedal and feral version of Lycanroc.
Dusk form is supposed to be the inbetween from standard wolf to werewolf. Look at how its orange, almost matching the red from Midnight form. There was effort behind it.