I've been keeping an eye on this for quite some time. Turns out the guy actually delivered, it's probably the most impressive hack I've seen so far Quick rundown
Multiplayer features: >can play Emerald with friends (up to 4 people) >all the players will roam the same world >can trade with them from anywhere >can fight every NPC in multiplayer mode (including gym leaders), they'll turn into multi-battles >...which means the whole story can be played in splitscreen with your bros >PvP is enhanced (can fight from anywhere with modern mechanics, all known modes are included)
Updated stuff: >every Pokémon is included, Pokedex has 900+ mons (even Alola and Galar forms are there) >you can actually catch 'em all >no, it's not just a pile of shallow reskins, they're actually fully implemented >battle system updated with modern mechanics (up to 8th gen) >mega evolutions and Z moves included >all items are also updated (up to 8th gen too)
New stuff: >can choose between 10 avatars from all generations (can also switch trainer whenever you want) >can choose between 40+ starters >up to 6 pokémon can follow you around (HG/SS style) >you can actually see and approach wild pokemon roaming in the grass/caves/sea (all of them have dedicated overworld sprites)
Quality of life improvements: >can rematch almost all trainers whenever you want >new respawn system for items and berries >no need to waste space for HMs to progress (just get the item and you'll be able to use the move whenever you'll need it) >nursery can be accessed from the PC, number of pokémon simultaneously allowed there is increased (there's a new menu to check how they're doing) >no need to bring your eggs around to hatch them, you can put them in a special box instead (up to 30 eggs)
New options: >multiple game modes (normal, randomized, cheat enabled) >multiple difficulty levels (five, from very easy to very hard) >can set shiny % rates before starting the game
>Giovanni from Kanto >Charizard from Kanto >Mewtwo from Kanto >Professor Oak from Kanto >Red from Kanto >Grimer from Kanto >Growlithe from Kanto >Alakazam from Kanto >Rattata from Kanto >Pidgey from Kanto >Tentacool from Kanto >Lapras from Kanto >Blastoise from Kanto >Wartortle from Kanto >Pikachu from Kanto >Ponyta from Kanto >Rapidash from Kanto >Muk from Kanto >Moltres from Kanto >Graveler from Kanto >Golem from Kanto >Exeggutor from Kanto >Marowak from Kanto >Meowth from Kanto >Slowpoke from Kanto >Slowbro from Kanto >Farfetch'd from Kanto >Weezing from Kanto >Articuno from Kanto >Zapdos from Kanto >PC from Kanto >Pokéballs from Kanto >Daycare from Kanto >Surfing from Kanto >Trainer Battles from Kanto >Lvs from Kanto >Tall Grass from Kanto >Wild Pokémon from Kanto I will now play your game