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Adapt the instructions found here: https://github.com/pret/pokeemerald/wiki/Triple-layer-metatiles
The steps should be nearly identical but with a few name changes since it's Firered instead of Emerald.
When you get to the part about using the python script, use this python script instead: https://gist.github.com/Snaid1/634847353fd320ea24aa71271afb9cde