boot 3 or mode 3 should be a selection from bootntr selector
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What is Mode 3 ?
Mode 3 is a version of BootNTR which will allows you to use NTR on games that use Extended Memory Mode on Old3DS (such as Pokémon Moon/Sun, Monster Hunter Generation...).
To use it, just launch the Mode 3 and when it tells you to press Home, you press Home and launch your game directly, without closing the Selector app.
Does Mode 3 replace the Normal version, or do I need both ?
Short answer: no and you need both.
This concerns only the Old3DS's users, not the users of the New3DS.
You need both, because the Mode 3 is only for games using the Extended Memory Mode.
On others games, you need to launch the Normal version just like before.
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(the above is taken from the faq section of the page i linked for you)
this game is not very intensive/large there is no reason it should need extended memory mode (boot3)
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also i have never made my own plugins . . . where did you get this information?