Pokémon Radical Red

Pokémon Radical Red is at its core a difficulty mod, but with massive additional features added to help you navigate through this game's difficulty.

Much higher difficulty, with optional modes to add or mitigate difficulty
Built-in Randomizer options (Pokémon, Abilities and Learnsets)
Physical/Special split + Fairy Typing
All Pokémon up to Gen 9 obtainable (with some exceptions)
Most Moves up to Gen 9
Updated Pokémon sprites
Mega Evolutions & Z-Moves
Most Abilities up to Gen 9
All important battle items (with some exceptions)
Wish Piece Raid Battles (with Dynamax)
Mystery Gifts
Reusable TMs
Expanded TM list
Additional move tutors
EV Training Gear and NPCs
Ability popups during battle
Party Exp Share (can be disabled)
Hidden Abilities
Day, Dusk and Night cycle (syncs with RTC)
DexNav, which allows you to search for Pokémon with hidden abilities and more
Even faster turbo speed on bike and while surfing
Abilities like Magma Armor, Static, or Flash Fire have overworld effects like in recent generations
Destiny Knot, Everstone have updated breeding mechanics
Lots of Quality of Life changes
... and more!