Oak gives you National Dex, Dexnav, Mega Ring, Z Ring, and Dynamax Band at the start of the game (Mega Stones, Z Crystals, and Dynamaxing isn't available yet, but useful for a later update.).

Exp Share at start of game option (by default its off, you have to turn it on by using it).

Pokemon, Learnset, and Ability randomizer at the start of the game, allowing you to enable / disable any of them.

All 898, forms, and variants coded into the game, allowing you to get them with the randomizer.

This hack is different and uses Complete Fire Red Upgrade's new features and its randomizer feature, and Dynamic Pokemon Expansion to allow you to get any of the 898 available Pokemon!

I didn't do much, just download Leon's base, and make sure you could randomize it, then upload. This is an update/remake to an old 'hack' I made, Fire Red 807 Randomizer. 1.2.2: Actually fix flash being unavailable 1.2.1: Fix gold teeth not being available. You should be able to get Flash easier now too. None of the sevii islands or things on them have been changed, and Seafom Islands haven't been changed. If a route has grass with less water, I didn't change the water. If a route has mainly water, surfing encounters have been changed. If a route has mainly grass, grass encounters have been changed. Pokemon Fire Red 898 Randomizer Current Update: 1.2 - Make all routes have unique Pokemon.

Pokemon leaf green randomizer