https://www.romhacking.net/hacks/8069/

Here is a summarized list of the changes:

Reworking Evolution. This entails a large enough number of changes by itself, from redoing the requirements for each species to avoid overlap that would cause unintentional evolutions, simplifying how the inner working of certain requirements, providing equal number of evolutions to each species, remove the Priority system that could change the resulting evolution even if the player did things right, etc.

Tweaks to Techs, trying to make all of them have a niche to fill to feel useful, toning down the ones that were absurdly powerful, making weak Finisher Techs more in line with the standard power of each tier of evolution, improving the chances and fairness about learning Techs, changing the moveset of a few species, etc.

Tweaks to Items, to provide more variety in their effects, make more of them more useful to the player, specially related to food. Items lying around the world have also been extensively changed so there are more than Digishrooms out there. Evolution Items now provide Stat Gains and Lifespan boost when necessary.

Changes to enemy Digimon. From minor stat tweaks to either fortify or tone down specific ones, to improving the Item drop chances and variety, increasing the amount of Bits obtained by battle to amounts that actually help the player, Boss battles providing guaranteed Item drops where possible, some Tech changes to provide more ways to learn Techs that were a single-time-only chance, etc.

A big number of changes for other mechanics, such as extending Lifespan, File City’s Restaurant, the sleep and eating habits of Digimon to fix things like Gabumon’s absurd feeding needs, improving Drimogemon’s Item search shop, changes to the Arena to be more fair, expanding Factorial Town’s Evolution system, raising the chances for random Boss Digimon to appear to a more sane amounts, and quite a few more.

Extensive text cleanup where possible. This is not to change the weird feeling of the script which gives it its own weird charm, but to fix the many, many typos, incomplete lines, glitched text, game-breaking textboxes that would hang up the player and others. No way Maeson would touch gems of writing such as “He ruined my research with Evil”!

Inserting three* unused Digimon species as playable and fully functional, that can be obtained through normal evolution, and have different Techs to differentiate them from the original versions they’re copying.

Several optional patches that can restore or alter a few of the elements changed in this hack, disable the Tech Bonus requirement that could negatively affect evolution, and a collection of extra patches that will change the Starting Digimon when beginning a new game, providing much needed early-game variety.

A new mechanic has been added as an optional patch, in which a small system is created that gives your Partner Digimon a power boost to an specific Tech based on its current species (for example, as a Palmon your partner will do more damage using Poison Powder) and on the Tech Menu, red numbers will point out to the player which Tech each species empowers.

Filename	Size	Note
Digimon World Maeson (Full - v1.06)	227.50MB	Hack
Digimon World Maeson (v1.06)	227.47MB	Hack