RPG Maker XP games (including Pokémon Essentials) typically store save data in SaveXXX.rxdata (e.g., Save01.rxdata) inside the game folder.
This file is a Marshal.dump of a Ruby object (usually an array or a hash). Pokémon Essentials saves contain:
There are web-based editors specifically designed to read .rxdata files. rpg maker xp pokemon save editor
If you have ever tried to drag a .rxdata file into PKHeX, you already know the frustration. Official Pokémon games store saves in a proprietary Nintendo format. RPG Maker XP, conversely, uses a serialization library called Marshal to create .rxdata files.
If you just want to modify your own save quickly without programming: RPG Maker XP games (including Pokémon Essentials) typically
Always back up your save file before editing.
If you corrupt the save, you lose your progress. Copy your save file (e.g., Game.rxdata) to a safe folder on your desktop before opening it in any editor.
A standard RMXP save file (typically named SaveX.rxdata, where X is a number) is not encrypted. It contains a serialized Ruby object—usually an Array or a Hash—storing: There are web-based editors specifically designed to read
We tested a simple editor on Pokémon Uranium (a popular RMXP fan-game). Using a Ruby script executed via the game’s RGSS Player, we modified the save directly: