Monster Difficulty(Hard Mode)

Monster Difficulty(Hard Mode)

How Much Stronger are the Enemies in Hard Mode in Comparison to Normal Mode? For Example: A Fossail in Normal Difficulty has HP:5960, P.Atk:398 P.Def:305 M.Atk:345 M.Def:338, and in Hard Difficulty has HP: 13940, P.Atk:847 P.Def:707 M.Atk:767 and M.Def:757. How do I Determine What Level I Need to be at in order to defeat Monsters in Hard Difficulty with ease, because it Doesn't tell Me the Monster's Level When I use The Magic Lens, and even if I were to look it up in my Enemy Book, it would only show me it's Level and strength in Normal Difficulty. Not In Hard Difficulty. Is there a Trick to determining What Level a monster is at in Hard Difficulty? For example if I were to Subtract the Enemy's HP in Normal Mode from the HP of the same enemy in Hard Mode, would I be able to determine it's New Level? I know this is a little Confusing, but I hope it's easy enough to understand.