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Trying to replace Mew sprite in Pocket Monsters Blue

Started by celebi23, October 03, 2020, 10:09:51 PM

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So, I'm trying to replicate the Mew Machine screen (32:15 - 32:27).  The machines were used in Spaceworld '97 & Spaceworld '99.  For some reason, they used the Mew sprite found in the Spaceworld '97 demos.  How difficult would it be to replace the Mew sprite in Japanese Blue with the Mew sprite form the Spaceworld '97 demos?

Basically, I want to go from
to this

I did see a disassembly of Japanese Red but, it hasn't been updated in over 3 years and doesn't compile right now.  It's been forever since I've done any rom hacking and I have no idea where I would start or what tools I would need.  Any help/suggestions would be greatly appreciated.

I found a workaround that was surprisingly easy.  First, I copied the Spaceworld 97 Mew sprite from the Spaceworld Disassembly GitHub.  Next, I placed it in the appropriate spot in the Pokemon Red disassembly.   Next, I compiled the roms.  I opened up the resulting "pokeblue.gbc" file in a hex editor.  I also opened up "Pocket Monsters - Ao (Japan) (SGB Enhanced).gb" in a hex editor as well.  In the compiled Blue rom, I went to the offsets 0x4112 to 0x425B and copied the data.  I went to the same offsets in Pocket Monsters Ao and pasted that information.  And it worked: