YMMV / Pokémon Ruby Destiny: Reign of Legends

• Game-Breaker: Life of Guardians' free Lapras with Perish Song. It's tanky enough to survive a hit and use the move, after which you can just wait 3 turns to knock out pretty much anything. Lapras with Perish Song is able to break pretty much every single boss fight in the game, even the bosses with high base stats.
• Good Bad Bugs: Running away from Giratina and Zah (while they have Shadow Tag as an ability, you can run from them using a Poké Doll or choosing to run after they faint one of your Pokémon) in Life of Guardians results in the game acting as though you won against them.
• Hilarious in Hindsight:
  • A new Fakemon in Reign of Legends, Baby Lugia, eventually evolves into Lugia. Years later, Pokémon Sun and Moon added Cosmog, which also eventually evolves into a legendary Pokémon, specifically Solgaleo or Lunala depending on the version.
  • Ice Tauros, an Ice-type variant of Tauros, appears in one area of Mt. Krystal in Rescue Rangers. Come Scarlet and Violet, a Paldean variant of Tauros with three distinct breeds would be introduced, each with different typings.
  • Life of Guardians has Touclipse, a Pokémon resembling a toucan. Come Sun and Moon, there's now an official toucan Pokémon in Toucannon.
• Sequel Difficulty Drop: The level curve in Rescue Rangers is much, much lower than it was in the previous game. The level curve plateaus at around level 25 for over two thirds of the game.
• That One Level: The second time you go through Shadow Valley in Rescue Rangers. It becomes a maze full of mirrors that make you face a copy of a Pokémon on your team every time you pass by one, in addition to random encounters that also appear there. To make matters worse, if you don't find the missing piece of a broken mirror by the time you get to the end, you have to start back from the beginning.