Ayrei - Lead developer, story, eventing, mapping, shaking and screaming in essentials.
Art Team - PrismShrimp, IronicOmens, Hypertox, Jaguarkia, Alcreed, Simonz, Katsuki, Nnekart
Original Music Tracks - Verity

Balance Team - Slate, Draco, Fictional, Deeffect

Programming team - PDM20, SexyRexy, WeOathKeeper

Mapping Assistance - Kristalwolf, IceGummi, Chobbis3, Dred

Concept art - CherubiNym, Cloudberry Sanchez
Previous contributors - JaoCraftBr, Celestial Fearow, Chobbis3, Chobbis4, Pixeldust64, Givemeloop, Kana, Darkside Official, GlowingOverlord, Rexaura

Advanced Battle AI - Moto & Demice

 

 

Credits
Pokemon Essentials v19.1 by Maruno
Graphics and Scripts

Magiscarf

Celestial Fearow

JaoCraftBr
WesleyFG
SailorVicious (Formerly known as Heavy-Metal-Lover)
Shawn Frost
NSora-96
PeekyChew
MewTheMega
Kyle-Dove
Pablus94

Seiyouh
Princess Phoenix
Zeo254
Claisprojects.com
Minorthreat0987
The-Red-Ex
UltimoSpriter
TyranitarDark
DarkDragonn
rafa-cac
Phyromatical
Alucus
Newtiteuf
ChaoticCherryCake
moca
Akizakura16
Kyle-Dove​
Clara-WaH    
ThatWelshOne_
raZ
Marin
Maruno
Nuri Yuri
PurpleZaffre
Savordez
Vendily
Mr. Gela

yellO
Voltseon
Neo-Spriteman
VanillaSunshine
PurpleZaffre & Maicerochico
AtomicReactor
Zerokid
HeroAlistar
Redblueyellow
Amethyst
Jan
SteamyJ
Anonaplacca
Zumi
Bazaro
Puggsoy
Koyo
Smeargletail
Alex
Noscium
Leparagon
N-kin
fishbowlsoul90
princess-phoenix
DatLopunnyTho
Conyjams
The cynical poet
LuigiPlayer
Falgaia
Pikafan2000
Mashirosakura (Magearna recolours)
Lord-Myre
MillaLya
AveonTrainer
JorgeBurgos
KajiAtsui
cubeR
DiegoWT    
rhaidor
KnoblePersona

IndianAnimator

Demice

eriedaberrie#1569
NoProbro
Biggusweeabus
Taiga

idilio

Ekat

Heartlessdragoon
Vurtax
Dragoon

Fabnt

J-Treecko252
Elle aka Midnitez-REMIX

Sefti

Magna-Ryunoid
Amras Anárion

Inkaline

erma96

Brawligator

PikachuMazzinga

Music
GlitchxCity
VanniluxePavilion
Kamex
Bliitzit
Sheddy
Mewmore
BitSymphony
CatchDalgo
Jasper Stories

Battle backgrounds
Aeveontrainer
Advanced Pokedex
FL
Gen 9 Project
Script Gen 9 and Adapting PLA for v20:
-Caruban

PBS for Gen 9:
-Caruban
-PorousMist (Updated the short abilities, items, and moves description)
-DJChaos (TM Items)

Pokemon Gen 9 Battler Sprites:
The-King-Of-Roads-X, Mak, leParagon, Caruban, Azria, Mashirosakura, Katten, Jinxed

Pokemon Gen 9 icons:
-ezerart

Pokemon Gen 9 Followers:
-Azria, DarkusShadow

Gen 9 Item sprites:
-Caruban, lichenprincess

Pokemon Gen 9 Cries:
Edited from Lightblade Absol's Gen 9 Cries compilation video

Original Pokémon: Legends Arceus Expansion Script :
-StCooler (Original script for Gen 8 Project in v18 and Status sprites)
-PorousMist and curryofthepast (Adapting the script for v19.1 use)

Some item PLA icons :
-AztecCroc, 3DJackArt, Caruban, lichenprincess

PLA Pokemon cries ripped:
-Morningdew

Pokeballs battle animation and summary icon:
-Caruban
-WolfPP (Beast ball battle animation)

PLA Pokemon icons:
-LuigiTKO

PLA Follower sprites:
Boonzeet, DarkusShadow, princess-phoenix, ezeart, Wolfang62

PLA Sprites from Smogon Gen8 Sprite Project :
-Blaquaza, KingOfThe-X-Roads, KattenK, Travis, G.E.Z., SpheX, and Hematite

Gen 4 Style Version
Gen 9 sprites:
KingOfThe-X-Roads, Mak, Red7246, Vent, Caruban, leParagon, Sopita_Yorita, Z-nogyroP,
Alxndre~◇, Mashirosakura, NanaelJustice, KRLW890

PLA sprites:
Travis, KingOfThe-X-Roads, Blaquaza, leParagon, Red7246, G.E.Z., Katten, Vent, Cesare_CBass, AlexandreV2.0, PKMNTrainerRick., CarmaNeko, JWNutz, Erkey830

Gen 9 Icons:
Vent, Katten, leParagon, Cesare_CBass

PLA Icons:
LuigiTKO, Pikafan2000, Cesare_CBass, Vent, Cesare_Cbass, MultiDiegoDani, leParagon, JWNutz
and thanks for Pokémon Icons Act 2.9 - Teracristalizando