Version 4.0 unlocks the post-game Sevii Islands earlier. You can access new raid battles and battle the "Elite Four Redux"—a harder version of the Elite Four with legendary teams.
A new in-game tool that displays a Pokémon’s base stats, EVs, IVs, and evolution methods on a single screen. Download Pokemon Radical Red -v4.0-
A new in-game menu provides detailed information on Base Stats, IVs, EVs, Happiness, and even evolution methods in one screen. Version 4