I want my rom hack to have one of two rivals being the opposite sex counterpart, but I am really unsure of how to do so, and cannot find a tutorial for it. Any help would be very much appreciated.

Need help scripting a rival as an opposite sex counterpart
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Heyho, just stating that we are, as you might or might not have seen, a german board, so it might be the case that not everyone understands what you are saying, anyways...
You should probably check out the `checkgender` command, which lets you branch your script according to your own gender. If you want your rival's gender you just have to think the other way round.
~Sturmvogel