>>54811000>>54811322 brought up some good and obvious QoL improvements such as all Pokémon obtainable, single-player trade evos, IV and EV adjusters, harder boss battles, and HM key items.Adjust encounters for a wider variety of Pokémon.
More double battles overall whether it's adding wild double battles or changing some trainers to have them battle in the format.
Give the Elite Four higher level teams for rematches.
Like in ORAS, have notable characters as opponents in Contests.
Add a way to reset contest conditions.
Have all e-reader content available.
Bring back the day-night cycle.Make Mirage Island and the Lilycove rooftop sale more accessible by having them appear during certain hours of the day.
Have the old guys and Pokémon Center ladies all encounterable without having to mix records.
Make all TMs and tutor moves reusable or reobtainable. Also include the Gen 3 tutor moves not found in Emerald.
Add a Lucky Base filled with Chansey/Blissey in the postgame for EXP grinding.Add a superboss double battle vs Steven and Wallace after you defeat their postgame teams once. 
