>>33314280Emerald's Battle Frontier is considerably harder. 2 additional facilities on top of Emerald's unique facilities being significantly harder.
Battle Arena - Need to be careful with what attacks you use, can't switch, elimination every 3 turns
Battle Palace - Depending on nature, Pokemon has a certain % chance of using an offensive, support, or defense move (the latter being support moves that all target the user). This percentage changes as the Pokemon's HP is less than 50%.
Pyramid: Pitch-black light, wild encounters (many of whom inflict status conditions), and impossible to see trainers and blue triangles.
Pike: Luck-based facility where you have to encounter Pokemon that inflict status on you, trainers (sometimes tag battles), and wild Pokemon that may also inflict status on you.
These three facilities alone are harder than anything Platinum has.
Battle Hall is tedious, not hard.
Battle Arcade has a random event happening each match, but the effects ends after the battle.
Battle Castle is pretty much a landslide if you save up your CP.
