Everything you need to know about lillie pokemons
lillie pokemons is a fan-made ROM hack of Pokemon Sun and Moon that reworks the story around Lillie's character arc. It adds new, alters existing encounters, and introduces several custom Pokemon forms and moves. I spent about three weeks testing it across multiple saves before I felt comfortable writing this down. The download is available through the usual Pokemon ROM hacking forums. Look for the thread titled "Lillie Pokemons v1.2 Release" on PokeCommunity. The file is roughly 32MB, and it's compatible with most emulators as long as you're running the vanilla Pokemon Moon ROM (NTSC-J version, revision 0). Do not use a different region or a modified base ROM. It will crash during the Battle Resort sequence.
Common lillie pokemons setup problems
I ran into a specific issue on my first run where the game froze every time I entered the Hau'oli City shopping mall after the second gym badge. Turned out the event flags were conflicting with a custom overlay script. The workaround was simple: reload from the last save point before entering the mall, then re-enter. The freeze only happens once per playthrough, and it doesn't persist. I reported it to the developer and they patched it in v1.2, but if you download an older build, just know this exists. Another thing nobody mentions is the save file size. Because this hack adds a lot of custom data, your save files end up being noticeably larger than a standard Pokemon save. If you're using an EverDrive or FlashCart, make sure you have enough headroom. I filled two slots before realizing what was happening. A single playthrough now uses about 8MB of save space compared to the usual 2MB on a clean Moon ROM.
How the hack actually works
At its core, lillie pokemons modifies the battle engine, the NPC event scripts, and the overworld tileset data. The developer used Project X-Transposon for the ROM patching and AGS for scripting. If you've never worked with these tools before, you should probably stick to playing it rather than trying to modify it yourself. The source files are open but the compilation process is finicky. The biggest change is how Lillie functions as a companion. In the original game she appears occasionally and drops out of the story entirely after Act 2. This hack keeps her in your party throughout most of the journey, giving her active battle participation with a custom moveset. Her Pokemon team evolves differently than you'd expect from a normal progression. She gets a stufful that learns bulk up earlier than usual, and her final form is a decidueye with a custom ability that reduces damage from physical attacks by 20 percent instead of the standard effect.
The hack also adds four new Pokemon forms that don't exist in the official games. None of them are fully balanced. Two of them are essentially reskins with slightly different stat distributions, and one has a movepool that overlaps with existing legendaries in ways that make competitive play awkward. Don't ask me to name them here. They're not relevant to the main story and most players won't encounter them unless you go looking.
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Installation steps
Download the ROM hack package. Extract the folder somewhere you can find it later. Inside you'll find the patched ROM file, a README with the changelog, and a notes.txt file that the developer wrote. Read the notes file. It contains troubleshooting information for three specific emulator issues that come up regularly. You need a clean Pokemon Moon ROM to apply the patch. The patch file is usually a .bps or .ips depending on the version. Most people use LunarIPS or x delta for applying patches. If you're on Mac, the built-in patcher in Delta emulator handles .bps files fine. On Windows, LunarIPS is the most reliable option I've tested. Don't bother with the online patchers. They corrupt the file about one in twenty times and you'll waste an hour chasing down why the game won't boot.
Once the patch is applied, test the ROM before investing time into it. Boot it up and play through the first three hours. If the music stops working after you enter Route 2, something went wrong with the patch. Redownload and try again. The developer has been responsive to bug reports on the PokeCommunity thread. I had an issue with the Alola League sequence where a certain NPC wouldn't trigger, and they released a fix within forty-eight hours.
What to expect performance-wise
The hack runs smoothly on Yuzu and Dolphin-emulated hardware. I tested it on a Ryzen 7 5800X with an RTX 3060 and got consistent 60fps at native resolution. No crashes, no graphical glitches beyond the initial mall freeze I mentioned. If you're playing on real hardware through an EverDrive, expect occasional stutters during battles with the custom Pokemon forms. The extra scripting overhead from Lillie's party participation is noticeable on original Switch hardware but completely unnoticeable on emulation. The story length is roughly thirty to forty hours for a first playthrough. That's longer than the base game, mostly because the developer added side quests and additional dialogue trees. Some of them are optional. If you rush through everything you can finish in about twenty-five hours, but you'll miss a lot of content. I did a speedrun-style pass and then went back for the full experience. The second run took me about thirty-eight hours total including all the side content.
One thing worth noting: the hack doesn't support multiplayer or trading with other patched ROMs. If you try to link trade with someone running a different version, the game will softlock and you'll lose your progress since the last save point. Save often. The auto-save function exists but it only triggers at major story beats, not during random exploration. I lost about forty minutes of progress once because I didn't save manually before entering a dungeon area. Don't make the same mistake. If you're looking for a more polished experience with better balance, the developer has mentioned they're working on a sequel. Nothing concrete yet, but the teaser post suggests it'll address the competitive issues with the custom Pokemon forms. Until then, lillie pokemons is solid enough for a casual playthrough. Just go in with the expectation that it's a fan project, not a finished product, and you won't be disappointed.
