"Yes, there was a lot of work done for Hard Mode both for regular enemies & for bosses. It's not just the raw health & defense numbers that are different, but also the speed of the opponents attack bar (frequency) that have been adjusted. As the user starts to progress the boss battles will start to become very challenging. Some battles later on that may have took 20mins on Normal Mode before could last 45-60mins+ mins on Hard Mode.
General world enemies in Grandia II Hard Mode are more difficult because of an increase in their frequency of attacks, their increased HP, and in some instances their ability to take damage. This makes each enemy engagement more risky for the player, while still providing the same reward and XP curve, ensuring that enemy difficulty does not outpace player advancement. Combat has not been ramped up overly excessively for world enemies, as the player is never a great distance from a save cone and we don’t want Hard Mode devolving into a constant shuttling between the save cone and the next world enemy.
Bosses in Grandia II HD Hard mode however, have been made significantly more difficult. Their attacks are much more frequent, forcing the player to make constant decisions about when to heal, boost, or attack; balanced against the player’s capacity to counter boss attacks with defensive maneuvers. Bosses also have large boosts to HP, defence, and in some cases even their base damage values. Vulnerabilities to specific attacks have also been decreased, but not so much that enemies lose their “personality”. This ensures that players still have an avenue to attack bosses in specific and tactical ways. Regardless of these increases though, players should be able to beat any boss via a tactical approach, regardless of the leveling up choices they’ve made prior to that point in the game."