Item Creation in FireRed: Step by Step, From Start to Finish
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June 19th, 2012 (9:55 AM). Edited June 20th, 2012 by Robert Conley.
The Anti Spiral Homeworld
Originally Posted by
Evolution stones are trivially easy to make, and they do not require any sort of script.
Going from this tutorial, follow it up until the step on Item Manager. When you get there, go ahead and do what he tells you (the item's index, name, and description), but also check the values for one of the existing evolutionary stones (the specials and things like that). Set all of those exactly the same in your new stone.
Then, convert the item's index into decimal, subtract 13 from it, and multiply the result by 4. Now, convert the result into hex, and add it to 0x2528BC. Open up your hex editor, and go to that address, and replace what is there with "56 28 25 08.
Now, if you set a Pokemon to evolve using your item, it'll work.
Then, continue his tutorial through the image and palette inserting and you're done - you do not need to do any kind of script. For this method (and it is the only method I know of), you do not even need JPAN's Hacked Engine.
I did all of this and everything seems to work fine except when I set Pokemon to evolve with the item they don't. For testing purposes I set Bulbasaur to evolve into Butterfree using the item but when I tried to use it it said it would have no effect. I'm not sure but the hex editor might be my problem, do I just replace the first four values or the whole 16 value line?
To give some more info:
I made the index number 34, subtracted 13 to get 21, multiplied that by 4 to get 84, switched it to hex and got 54, added it to 0x2528BC to get 0x252910.
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