rgss202j.dll
This file is not a system component: supplied with the rpg maker game. Restore it from the source that installed it rather than downloading a replacement.
Do not download this DLL on its own
Searching for a missing DLL by name leads to sites that hand you that single file. It is one of the oldest and most effective malware delivery methods there is, and a system DLL from an unknown source is indistinguishable from a deliberately modified one. There is never a legitimate reason to obtain a runtime component that way.
What it is
The Ruby Game Scripting System runtime that RPG Maker games use. Each RPG Maker version has its own build, RGSS202J, RGSS300 and others, and it ships inside the game folder.
Where you see it: RPG Maker games, particularly fan translations and indie titles distributed as a plain folder rather than through a store.
Reinstall or re-extract the game. If it came as an archive, an incomplete extraction is the usual cause. The version number matters: an RGSS300 file will not satisfy a game asking for RGSS202J, which is why copying one from another game usually fails.
Why there is nothing to download here
There is no verified download we can offer for this one, because installing a file is not the fix. The steps above are what actually resolves it. That distinction matters: the sites ranking for this file name are selling a download that would not have helped even if it were safe.