Ever wondered what happens when you take Pokémon and combine them with impossibly cute anime girls? Well, you'd get Moemon. Moemon (short for "Moekko Monsters") is a Pokémonromhack of FireRed that replaces all of the Mons with Moegijinka. While requiring several downloadable patches to work correctly on an emulator, there is no real plot change, the entire game is simply moe personifications of Pokémon, which would obviously contribute to the popularity of the hack. Other hacks, such as one of Emerald emerged after the original FireRed hack, however, the original is the most well known and referenced on sites such as Bulbapedia. The Emerald hack also has it's fair share of problems, which would border on Early-Installment Weirdness if it was the first installment. Many of the tropes that pertain to the original game this is hacked from also pertain here, and can be viewed on the original game's page. The game is still given some focus, as patches are released to update sprites and such, giving it improvements much like DLC does for any other game. Unfortunately, at least for the fans the game has, Moemon is currently only limited to GBA ROM hacks of FireRed and Emerald, no DS hacks such as the Sinnoh and Johto remakes have been shown to be in production at all.Notably, there are many more installments for the Moemon in Japanese than in English, and many of them haven't been converted to English yet, such as updated sprites and the like, but some people are working on getting these through for English speaking players to enjoy.
Apathetic Citizens: This is standard for Pokemon, especially given the whole Team Rocket fiasco, but taken to new levels here in that no one sees any problem with capturing cute little girls to do battle. Of course, the players don't care either, but you'd expect a reaction.
The Dev Team Thinks of Everything: Carrying over from the actual games the ROMs were hacked from, there is a code which uses Spinda's personality value to generate exactly 4,294,967,296 (give or take) different variations of Spinda, or double that number if Shiny Spinda are considered different variations.
Downloadable Content: An additional FireRed patch is in the works, by Youtube User oOMikuMikuOo. It will contain updated sprites for all the Pokemon, and the sprites on the menu are updated as well. This patch does not work on the Emerald hack, patching it in this manner results in a major Game-Breaking Bug.
This makes it the only known Pokemon game to change all sprites within a "generation", if one counts the FireRed and Emerald hacks as "Generation III" like the original games they're based off of.
Gotta Catch Them All: It's Pokemon, so this is to be expected, but, given how absolutely adorable every Moemon is, you will want to catch them all.
One Game for the Price of Two: Would be difficult, considering it's a romhack, and thankfully this was averted. The starters and even Eevee are catchable, making it easier to obtain all Pokémon.
Updated Re-release: With the original being a hack of Pokemon FireRed, it manages to be this twice, albeit unofficial. While FireRed was a remake, it could count as a stretch, and Moemon manages to replace all the Pokemon with ginjika, therefore making this game an updated rerelease of a rerelease. Try not to think about it too much.
Adaptational Attractiveness: Not counting every single Pokemon on the list, this version's Jynx is...rather adorable, compared to the other
Ambiguously Brown: After the additional patch that updated the sprites was released, several Pokemon such as Jynx and Onix now qualify. It's very much a Justified Trope for Jynx, who now looks like what she is based on, ganguro (ガングロ face-black), a fashion trend in Japan.
Bishoujo Line: The premise of the entire series, super powered creatures becoming humanoid. However, this is a trait that is most notable in Emerald Moemon, as when they evolve, the mons take on more humanoid forms. In contrast, Kirlia takes a step backwards over the line. While commonly accepted by the fanbase as one of the sexiest Pokemon short of Loppunny, it's Moemon forms as Ralts and Kirlia are very adorable...then when it evolves, it's simply a regular Gardevoir. The latest patch, thankfully, fixes this.
Super Human Trafficking: Pretty much this entire game in a nutshell. Gets really noticeable when it comes to trading Pokemon. That's not even the worst of it, the worst is Team Rocket, who specializes in selling Pokemon, especially rare ones, and sells quite a few at the Game Corner. That's it, Red! Go buy your Humans!