They were all easy.
Here is my scale of Undertale Fight difficulty:
EXTREMELY EASY: Everyone but Undyne, Sans, Photoshop Flowey, and Asgore.
VERY EASY: Photoshop Flowey, and Undyne (Undying)
EASY: Sans
Medium: Asgore
Medium Rare: But nobody came
Hard: But nobody came
Very Hard: But nobody came
Hellish: But nobody came
Here is my scale of Undertale Fight difficulty:
EXTREMELY EASY: Everyone but Undyne, Sans, Photoshop Flowey, and Asgore.
VERY EASY: Photoshop Flowey, and Undyne (Undying)
EASY: Sans
Medium: Asgore
Medium Rare: But nobody came
Hard: But nobody came
Very Hard: But nobody came
Hellish: But nobody came
flowey is easy to be honest, a lot of healing and weird hitboxes. asgore is much worse honestly. and undyne if you don't know what you are doing. metta wasn't easy either though