Old Chateau lists 4 Pokémon across 19 encounter methods (grass (emerald in the gba slot / firered in the gba slot / leafgreen in the gba slot / ruby in the gba slot / sapphire in the gba slot), grass, grass (emerald in the gba slot / firered in the gba slot / leafgreen in the gba slot / ruby in the gba slot / sapphire in the gba slot), grass, and more), between level 12 and 16. 2 of them are on no other route's wild tables in this guide: Gengar, Rotom.
Old Chateau in other guides
The same area in other ROM hacks on this site. Each one has its own encounter table.
