>>48456652> Battle CastleSince the Castle is based around the idea of the accumulation of money and expense the boss of it could be Lostelle in a pretty roundabout way, since her father ran the Game Corner on Two Island in FRLG and some time would've passed since then and given the Game Corner in Johto (outside of Japan) was reworked a fate similar to the one in Hoenn might've befallen the one on Two Island. Since Lostelle's history is with the Game Corner perhaps the Battle facility for her would be a Battle Showground.
> Battle FactoryOk so this one's pretty obscure but for the Battle Factory equivalent, the boss of it should be Cal, he appears in GSC but he also appears in Stadium 2 where his design is more distinct from Ethan's, in addition in Stadium 2 Cal has situations where his team is entirely randomly generated which fits with the entire idea of the Battle Factory's mechanics. As for his Battle Facility, the Battle Factory could probably stay as is or it could be changed to a Battle Stadium that has its design replicate the ones we see in Stadium 2.
> Battle ArcadeI could definitely see Primo being the boss of the facility, given gearing towards battle effects fits pretty well with his role in teaching the player the various game mechanics. Since his whole thing was communication (either through teaching via the Teachy TV or the chat system used to get the Egg Pokemon from him in HGSS) you could have his battle facility be the Battle Studio stylized around a tv film studio.
Pt.2/2