Using the scroller feature.
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To enable the scroller option in fwnitro, Rename scroller_example.txt to scroller.txt, and edit the file. (Text formatting instructions
are included in scroller_example.txt)  After editing, the final step is to run scroll_text_changer.exe to enact the changes
in installer.ds.gba (or installer.nds).  Once this is done, flash your DS(nitro) unit with the installer application from appropiate
folder that allows option of a scroller. ("scroller only\installer.ds.gba" or "scroller only\installer.nds" or
"Scroller, MKDS\installer.ds.gba" or "Scroller, MKDS\installer.nds")

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- a comprehensive guide by dualscreenman & caitsith2