Since I got the confirmation to do so, here it is.
Pokémon Gen 3 Lua Script
Creator: MKDasher
Supported emulator: BizHawk
Features:
Supports all Gen 3 main games (R/S/FR/LG/E)
Currently only US and JP versions are supported. Will have to manually add support for other regions.
Easy to use interface
RNG viewer for battles, encounters, catch rate, and even Pokérus
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NOTE: On Bizhawk, go to Config / Display... Then uncheck Stretch pixels by integers only.
ALWAYS make sure to backup your progress! There is a chance that BizHawk will crash suddenly because of the script.
EDIT: There was a problem with luainterface (the pre 2.0 lua) that occasionally causes memory leaks. For those using the older BizHawk versions before 64-bit exclusivity, always backup your progress. For those using the latest versions of BizHawk, you
should be fine as lone as you use kopi-lua/nLua.