To resolve this we have to look up the pointers to those addresses in the IWRAM (which do have a constant offsets) to get the start of each block. This means we cannot hard code offsets in order to look up data. The second, and larger problem, is that save data is split into 3 blocks that get randomly moved around in the EWRAM each time a warp is triggered or menu opened. In general Block 1 contains game flags and bag data, Block 2 contains trainer data and settings and Block 3 contains boxes pokemon and items. This key can be fround inside save block 1. We need to be careful that when going from Game 1 to Game 2 we XOR this data with Game 1's key then XOR it again with game two's key before we inject that data. Some data (e.g money and item counts) is obsfucated with an XOR key that gets frequently updated and will be different between games. Gen 3 save data structure is well documented, however 2 main issues. Current Party | (Length 0x258 bytes) | FR (0x02024284) / E (0x020244EC)įrom the save data we need to extract things like: Badges, Cross Game Flags (e.g running shoes/starter choice), Repel Steps, Play Time, Game Settings, Trainer Name/Gender/ID, Money, Bag Data, Boxed Pokemon e.t.c.Firefox may work but is prone to lagging (especially during speedup)Ī version of Sekii's tracker that supports all three game at once is now available at ĭata extraction can be broken into 3 main parts. When all 3 roms are loaded press 'start' and it should boot into a new game of Fire RedĮSC (or long swipe down) will bring up the emulation menu where you can change things like the seed.Crystal and Emerald will need to run some initialisation code when they are loaded Open the emulator in Chrome ( Edge is not supported).Use a rom patcher to apply the Crystal Dust V2 patch to a copy of your Emerald (U).Download Crystal Dust V2 patch from here here.Legally backup a copy Fire Red 1.1 (U) and Emerald (U).In a full randomisation there are 24 Gyms, 12 E4, 3 Champions and 1 final boss (Steven). If you are only randomising up to certain gyms you will never have to play beyond that point. This means you should always be able to beat Kanto Gym 1 before Gym 2(/3/4/5 e.t.c) however you might need to beat Johto gyms 1,2 and 3 before you can get to Kanto Gym 1. The logic only guarantees order within each region. The randomisation logic should make it so that it's possible to beat the Gyms, E4 and Champion in order. In this you start in Pallet Town where none of the loading zones have been randomised but that will change as soon as you get to Viridian. If you've not played a map randomiser before the goal is to find and beat the Gyms, E4, Champion (and final boss). The older version can still be played here but will no longer be updated. Memory is dynamically altered so you can keep your team, items, money and trainer data when moving between games/reigons.Ī major new release is now (August 2023) available with a complete change of the emulation core to use skyemu. This emulator mod loads and modifies Fire Red, Emerald and Crystal Dust ROMS so you can simultaneously play across Kanto, Johto and Hoenn. Welcome to the GBA Cross-Game Pokemon Map Randomiser.
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