Some trainer dialogue hasn’t been updated to reflect their new teams. You might face a “Youngster” with a Garchomp. That’s intentional for difficulty, but it breaks immersion.
A: No. Shiny rate is vanilla (1/4096). However, you can use the DexNav chain method, which works identically to the base game. Pokemon Rutile Ruby and Star Sapphire
By the time you reach the Elite Four, you are facing full teams of six Pokémon, all holding competitive items (Leftovers, Choice Specs, Life Orb) and possessing perfect IVs (Individual Values) and EVs (Effort Values). Some trainer dialogue hasn’t been updated to reflect