I've parsed their teams, they do reside in the narcs. In the General ROM info thread I give their location.
/a/2/5/3 ********* pwtpoke2 - 1000 files, first bunch are for PWT (second set)
/a/2/5/4 ********* pwttr1, 68 files - world tournament trainer pkm choices 1v1
/a/2/5/5 ********* pwttr6, 68 files - world tournament trainer pkm choices 6v6
/a/2/5/6 ********* pwtpoke - world tournament pkm sets (first set)
/a/2/5/7 ********* 1000 files, pokemon sets pretty much filled ~still diff (subway?)
/a/2/5/8 ********* pwt vgc top4 event, relic of dev testing which is unaccessible but I converted it here.
Problem is, I'm pretty sure that modding the underlying tournament structure would require edits to the overlays. No idea which one; that's the issue. If you want, you can just replace their sprites/text and just swap up which teams they choose such that you get the lineup you desire for your hack.
Might as well just make a PWT Download using alder and such, then change the sprites and text of the special trainers.