Pokemon Cosmic Emerald Version

Pokemon Cosmic Emerald Version

Download Pre-Patched Pokemon Cosmic Emerald Version GBA Rom

  • Creator: SkyVortex
  • Version: December 24, 2019 update
  • Hack of: Emerald
  • Updated: December 24, 2019

Pokemon Cosmic Emerald Version is a GBA ROM Hack by SkyVortex based on Pokemon Emerald. And it is now available to download. It was last updated on December 24, 2019.

Also, be sure to try out Pokemon Azure Horizons


Pokemon Cosmic Emerald Version is largely a “quality of life improvement” type of ROM hack, and does not alter the main storyline. It retains all the features the original Emerald has but adds several things to the mix to make it more fulfilling and fun to play. Remember those days when myths like going to the Moon after a certain number of rocket launches/weeks were a thing? Several things like that will be accounted for, but with some changes/twists to how they are done. There is a moderate increase in difficulty (not really big, just aimed more towards veteran players), but there are rewards to compensate.

Only a few newer-generation features have been added, as I wanted to keep this hack’s gameplay as close to the pre-2007 scene as possible while also adding a few of the newer games’ functional improvements. However, in the distant future, I may include a few newer-generation Pokémon as special appearances/events. Apparently, expanding the PokéDex may cause the game to require its own exclusive saves only, but I believe that will be fine as long as the hack’s saves are not used with the regular Emerald saves (or vice-versa, I think). You should also keep in mind that if I ever release an expanded-Dex version, it may not be compatible with a save file from the regular version of this hack. In any case, I will not stop updating the regular one and will continue to release it if that is the case. I’d also look for a way to make the old saves compatible with the new ones.

Description (by the author)

I first released this at PHO, then brought it to PokéCommunity (due to several requests), and now it has arrived at Silph Co. – which will now be its home base. I hope you enjoy it!

Okay, so this hack has been in the works for a long time, having been worked on in small phases at a time since I first learned about ROM hacking several years ago. I’m not sure when it was (maybe 2010?).

It had been put on hold several times due to life stuff, and I had even redone it from the beginning a couple of times to find and remove any and all glitches/errors; I spent most of the time figuring out what the most minimalistic/efficient ways to implement everything were. It’s finally here, and as of the most recent update, nearly all of the features I had planned are included!

To be able to quickly and easily pinpoint the cause of any errors, a change-log (different from the one here) has been kept documenting every single change that has been made (as well as dates of editing, revisions, and future ideas). To avoid glitches, program choices and how they were used were carefully considered. I’m also attempting to preserve the base ROM’s save-data structure so that the regular Emerald’s game saves remain ‘backward/forward compatible (originally for testing scripts, graphics, etc.). This may change in the future, but only on a separate branch of this project.


  • PRNG glitch has been fixed
  • All 386 Gen 1-3 Pokémon are available
  • New Evo Stone that evolves Trade-Evo Pokémon
  • More Roaming Legendaries
  • Events based on Day/Night and game completion status
  • Events/Legendaries have signature themes
  • Mirage Island relevant for PokéDex completion
  • Day & Night System
  • Upgraded B/W Repel System
  • TMs are re-useable
  • Pokéballs are re-useable until capture
  • Pokémon receive EXP on captures
  • EVs cap at 252
  • Steeper difficulty curve
  • Running when indoors

Useful Stuff

Pokemon Cosmic Emerald Version



SkyVortex, Banjora Marxvile, Beastly12817, BluRose, DizzyEgg, FamiliaWerneck, Gamer2020, HackMew, Jambo51, Jirachiwishmaker, Kleenexfeu, Kyledove, LU-HO, Mastermind-X, Prime-dialga, SabfromPC, The_Learner, ThomasWinwood, Wichu