YMMV / Pokemon Opalo

• Alternative Character Interpretation: Was Apolo always a scumbag, or did he have genuinely good intentions? A flashback scene to his childhood hints at the former, and both Derringer and Mustang see a slight kindred spirit in him, but before your trip to West Zephyra he's a Nice Guy with no indication that he wishes to dominate the world or oppress the natives like he tries to do later in the game.
• Anticlimax Boss: The True Final Boss, Unktena, can come off as this. While it can be a decent challenge, it is very vulnerable to lethal status that can get past its Magic Bounce (such as Perish Song or Curse). Its second phase is also borderline impossible to lose, making the boss feel overall like a victory lap rather than the ultimate threat the game has been building up to.
• Awesome Art: This game loves its character portraits and artwork, to the point that there's even an in-game gallery where you can see them in one place without looking through the game's files. They're all exceptionally well done.
• Awesome Bosses: Both the Great Spirit and the final battle against Apolo, the penultimate major bosses, are amazing fights with an incredible amount of spectacle and grandiosity, on top of offering a decent challenge that comes at the end of an otherwise fairly easy game. They both feel more climactic than the actual final boss itself.
• Moral Event Horizon:
  • Zalea crosses it when you meet her and she blows up the truck you and Apolo are travelling to West Zephyra in, crippling Mundanez and Vera and scarring Apolo's face. Also potentially crossed it before the start of the game when she poisoned Aquilon Town's lake.
  • Apolo's murdering of the Hissing Clan natives using the Peacemakers is when he truly goes off the deep end.
• That One Level: The Abode of the Great Spirit. While the actual Pokemon League is done in a way similar to Galar's Champion Cup from Sword and Shield, the Abode is more reminiscent of a typical Elite 4 challenge, where you must face the 4 custodians and the Great Spirit in one gauntlet without access to a Pokemon Center. The bigger issue, however, is that your Pokevial and healing items are taken away and you're given a limited number of Revives and PP restoring items, meaning you need to be conservative while fighting the diverse, strong teams of the custodians and Spirit (who himself has multiple legendaries). It doesn't help that you're sucked into the area with little warning and cannot leave until you finish the challenge.
• That One Puzzle: For English players, the Forgotten Atoll puzzle can be this due to a bit of "Blind Idiot" Translation. While it's already annoying to catch the 6 Unown necessary for the word that the puzzle hints at (not helped by the fact it's pretty easy to mix up the ! and I Unown variants), the word itself, ORIGIN, was, well, translated to English. The right word you need to find Unown for is ORIGEN.