Trainer battles should not become noticeably more difficult -- this is not a hardtype hack -- but should use actual combos. Helping Hand, Plus/Minus, items. Possibly improve AI so that they switch when a pokemon is at a -6 stat.

Berry trees in gen 3 absolutely suck.

Yields need fixing, later games' berries need to become obtainable.

It should notice if you have the mega ring.

Modern games have experience shared throughout the party, which speeds up level acquisition.

As encounters are expanded, the pokedex order should change so that pokemon you gain access to at the same time are clustered together.

This is a problem with vanilla Emerald and I don't have the skills to fix it, so we're stuck waiting on RHH to solve it.

As I don't want to rework TMs, useful/important TMs and move tutor moves from later gens should become egg moves.

The move deleter and move reminder's houses should contain both a move deleter and a tutor for egg moves.

Vitamins and effort berries should be easily available and usable to completely control effort points.

All HM stuff should instead use key items.

Simplify HM usage, add a shortcut between Fallabor and Fortree.

Currently, if you save partway through the E4 with only one pokemon alive and have no way to revive them, you are fucked. Gotta change that!

All trade evolutions need to be doable in single-player.

Old Amber is currently in Fiery Path.

Pokemon from gens 5 and onwards should not be commonly available, but should exist. Encounters ought to be mostly gens 1-4.

A full implementation will also free up all of the TM/HM flags as checkitem should be more than sufficient.