Original Trainer Tower Resource Article -trainertower.com/forums/threads/vgc-resource-index.134/

New to VGC? Where to get Started:

Making the Jump to Video Game Competitive Play - https://www.pokemon.com/us/strategy/making-the-jump-to-video-game-competitive-play/
Rules and Regulations - https://www.pokemon.com/us/play-pokemon/about/tournaments-rules-and-resources/
Event Locator -  https://www.pokemon.com/us/play-pokemon/pokemon-events/find-an-event/
Guide to playing VGC 17 Rules - http://pokemonaustralia.com/rotoms-vgc-resources-playing-with-vgc-2017-rules/

Building Teams and EV Spreads:

Training Battle-Ready Pokemon - https://www.pokemon.com/us/strategy/training-battle-ready-pokemon/
The Discovery of Pokemon Eggs - https://www.pokemon.com/us/strategy/the-details-of-discovering-pokemon-eggs/
PokeAus Breeding and Training Guide - http://pokemonaustralia.com/rotoms-vgc-resources-sun-and-moon-competitive-breeding-and-training-guide/
Smith's Introduction to Teambuilding - https://web.archive.org/web/20151205125529/http://nuggetbridge.com/beginners/an-introduction-to-team-building/
DaWoblefet's Ev Spread Guide - https://web.archive.org/web/20151215060520/http://nuggetbridge.com:80/articles/achieving-perfection-creating-specialized-ev-spreads-part-one/ and https://web.archive.org/web/20151218032013/http://nuggetbridge.com:80/articles/achieving-perfection-creating-specialized-ev-spreads-part-two/
Jio's EV Spread Guide - https://web.archive.org/web/20160329111308/http://nuggetbridge.com:80/blogs/entry/111-252-times-better-than-252252-advanced-ev-spreads/
Stat's Ev Spread Guide - https://web.archive.org/web/20160329115510/http://nuggetbridge.com:80/blogs/entry/418-bulking-up-a-guide-to-defensive-ev-spreads/
My teambuilding guide - https://youtu.be/tKdsUX_qxnE

Useful Knowledge and Content:

HeroOfTheWind's Guide to Probability - https://web.archive.org/web/20151231000045/http://nuggetbridge.com/blogs/entry/333-improbability-drive-a-guide-to-probability-in-pokemon-battles/
Feather's Building a Local Community - https://web.archive.org/web/20140729230316/http://nuggetbridge.com/articles/starting-a-community-a-guide-to-getting-involved-in-vgc-in-your-area-and-getting-others-involved/
Mindape's getting involved - http://pokemonaustralia.com/pokemes-amis-getting-involved-in-your-local-vgc-community/
Serebii Game Mechanics - https://serebii.net/games/mechanics.shtml

Battle Skills:

R Inanimate's Guide to Team Preview - https://web.archive.org/web/20151213160059/http://nuggetbridge.com:80/articles/theyre-eyeing-each-other-warily-team-preview-guide-ver-2015/
Bravierus' Defend Yourself with a Question - https://web.archive.org/web/20151020145353/http://nuggetbridge.com/articles/defend-yourself-with-a-question/
Thage's Foundation - https://web.archive.org/web/20150526205917/http://nuggetbridge.com/articles/building-a-foundation-in-pokemon-part-one/ and https://web.archive.org/web/20141029084121/http://nuggetbridge.com:80/articles/building-foundation-pokemon-part-two/
Superintegration's Momentum Management -  https://web.archive.org/web/20150927134235/http://nuggetbridge.com:80/articles/momentum-management-pokemon/
Zog's Playing to win - https://web.archive.org/web/20151218132208/http://nuggetbridge.com:80/articles/sardonic-hipsters-guide-vgc-2015-part-one-playing-win

Competition:

Bravierius's Sportmanship - https://web.archive.org/web/20140729151433/http://nuggetbridge.com/articles/caution-trainer-under-pressure-sportsmanship-in-vgc-play/
Makiri's Why we play Pokemon - https://web.archive.org/web/20170927223355/http://nuggetbridge.com/articles/why-we-play-pokemon/
Cybertron's how to win a regional - https://web.archive.org/web/20140701202240/http://nuggetbridge.com/articles/how-to-win-a-regionals-seven-tips-by-cybertron/
Lucien's Mental Preparations - https://web.archive.org/web/20151217071710/http://nuggetbridge.com:80/articles/top-players-talk-mental-preparation-nationals/

Player Mentality and Psychology:

Mindeape's Training for Pokemon like an elite athlete - http://pokemonaustralia.com/training-for-pokemon-like-an-elite-athlete/
Bearsfan's 7 Habits - https://web.archive.org/web/20151218134735/http://nuggetbridge.com:80/beginners/the-7-habits-of-highly-effective-trainers
Dawoblefet's Small Ways to improve your game - https://web.archive.org/web/20151217071705/http://nuggetbridge.com:80/articles/stepping-it-up-small-ways-to-improve-your-game/
Werford's Three Habits: https://web.archive.org/web/20160101160611/http://nuggetbridge.com/blogs/entry/561-three-habits-of-ineffective-players/
Dark 51's No Johns - https://web.archive.org/web/20150217185755/http://nuggetbridge.com:80/articles/no-johns-mini-treatise-consistency-efficiency/
Werford's Common Biases: https://web.archive.org/web/20151001014029/http://nuggetbridge.com:80/articles/common-cognitive-biases-competitive-pokemon/
5 Key Mindsets - https://breakingmuscle.com/fitness/the-5-key-mindset-qualities-of-successful-athletes

Useful Websites:

Pokemon - https://www.pokemon.com/us/
Trainer Tower - http://www.trainertower.com/
Trainer Tower Damage Calc - http://www.trainertower.com/damagecalc/
Sample Teams - trainertower.com/forums/threads/2018-vgc-sample-teams-thread.611/
Nugget Bridge - http://nuggetbridge.com/
Smogon - http://www.smogon.com/
Victory Road VGC - victoryroadvgc.com/
Global Link - https://3ds.pokemon-gl.com/
Showdown - https://pokemonshowdown.com/
Nimbasa - www.nimbasacitypost.com/
EmolGame - www.emolgame.jp/
Mirage Island - themirageisland.com/
Pokemon Australia - http://pokemonaustralia.com/
VGC with Hats - https://vgcwithhats.com/
thegamehaus - thegamehaus.com/
Battle Spot Frameworks - koro2.hatenablog.com/entry/2017/02/25/182925 and https://twitter.com/fallingmindz/status886667177281163264
VGC 2018 Championship Points Tracker - https://docs.google.com/spreadsheets/d/11L9qzRMJ510TVn38NCMwqlj2JjplH9GWTMguW6mbseg/edit#gid=1069517498
Friends With Cats VGC 18 Spread Sheet - https://docs.google.com/spreadsheets/d/19Ee7PdnzfNMq3xkkcEdK70hrNiAuSr4MU0qlmyTnPls/edit#gid=1112936796

High Level Player Youtube Channels

Aaron Zheng - https://www.youtube.com/user/CybertronProductions
Ray Rizzo - https://www.youtube.com/channel/UCUV4fC_HlxFe_Fwlybh2XiA
Wolfe Glick - https://www.youtube.com/channel/UC9OZkS1Mhl5UvKSiPrYqsxg
Markus Stadter - https://www.youtube.com/user/YoshiSkillz
Lee Provest - https://www.youtube.com/channel/UCi3LrHS-zJDTEO1Acml0Hxg
Sekiam - https://www.youtube.com/user/Ranbaster
Tommy Cooleen - https://www.youtube.com/channel/UCqp8hq56Y1lgBbpMG3W6N5A
Jamie Boyt - https://www.youtube.com/channel/UC022DzNVaQ5ojWC7BU788yQ
Giovanni Costa - https://www.youtube.com/user/RewindReplayTV
Haricot TV - https://www.youtube.com/channel/UCV1aAmztXWk-uM-nw57hFLQ
Francesco Pardini - https://www.youtube.com/channel/UCa9JE5VLKlswhz2n4BRPjdQ
Alex Gomez - https://www.youtube.com/user/Pokealexproductions
Alex Ogloza - https://www.youtube.com/user/AlexOgloza
HibikiVGC - https://www.youtube.com/channel/UCwSLlIlGeZpRReeEA9IfoLQ
Lunaxxl99 - https://www.youtube.com/user/lunaxxl99
Joshua Lorcy - https://www.youtube.com/channel/UCqiJbxV0-pPuTRHTEEeOTFA
JT Pkmn - https://www.youtube.com/channel/UCBIzJLYLuDjNsnsKbFaN9yw
James Baek - https://www.youtube.com/user/JamesWBaek

Other Youtubers:

Mr. Talent - https://www.youtube.com/user/NiPPsClips
Shadypenguinn - https://www.youtube.com/user/shadypenguinn
aDrive - https://www.youtube.com/user/xaDr1v3
Shofu - https://www.youtube.com/user/shofu
PokeaimMD - https://www.youtube.com/user/pokeaimMD
Jack the Battler - https://www.youtube.com/channel/UCCsuJHmLyjO-zwceSH27tZQ
Tablemon - https://www.youtube.com/channel/UCt2NlhRtMMF5mFlSZxTesiA
Rykku2isi - https://www.youtube.com/channel/UC3DvPlp_Ph-lpsvWe0L91iw
Thatsaplusone - https://www.youtube.com/user/THATSAplusONE
ShutupNrock8 - https://www.youtube.com/user/SHUTupNrocK8
SharpedDressedGaming - https://www.youtube.com/user/SharpDressedGaming
Dawoblefet - https://www.youtube.com/channel/UCfPigxmrYQYqDwTsKxlaBXg
Andrew Davis - https://www.youtube.com/channel/UCOTDARX6IyCkELkHk4Zwkiw
Puddles - https://www.youtube.com/channel/UCu6C0xAl8qe2XZTrf8i8jnA
Token Tube - https://www.youtube.com/channel/UCqUuqEiO9Jtv2Mc3aBsXC2g
Wryms Eye - https://www.youtube.com/channel/UCTDOZH0ZDVvBehiH-Rn-_5Q
Moxie Boosted - https://www.youtube.com/channel/UCAVKuhZ5Og4O86jkgUgUcyg
themodsen - https://www.youtube.com/channel/UCBXOWDxcq4NriEBuxGhm5sA
TheMegaLugia - https://www.youtube.com/channel/UCmw86b-IxJtcgUn013IZP0g
korkenbroski - https://www.youtube.com/channel/UCDA8H6VQv1p7-SJ5crA3sJA
koffing sonriente - https://www.youtube.com/user/koffingsonriente
EGB4TV - https://www.youtube.com/user/EGB4TV
LouLou The Pikachu - https://www.youtube.com/channel/UCxsQtitzNuJxrf0gVa17llA

Twitch Channels:

CybertronVGC - https://www.twitch.tv/CybertronVGC
WolfeyVGC - https://www.twitch.tv/WolfeyVGC
13Yoshi37 - https://twitch.tv/13Yoshi37
HibikiVGC - https://twitch.tv/hibikipkmn
TmanVGC - https://twitch.tv/TmanVGC
Sejun Park - https://twitch.tv/sejun_park
OsirusStudios - https://twitch.tv/osirusstudios
RyuzakiVGC - https://twitch.tv/ryuzakiVGC
PokealexVGC - https://twitch.tv/PokeAlexVGC
Jamesspeed1 - https://twitch.tv/Jamesspeed1
pball0010 - https://twitch.tv/pball0010
MrTalent_ - https://twitch.tv/MrTalent_
Mastermark6 - https://twitch.tv/mastermark6
Lavaburst14 - https://twitch.tv/lavaburst14
DoctorCaden - https://twitch.tv/DoctorCaden
Optofire - https://twitch.tv/optofire
Alchem1st - https://twitch.tv/Alchem1st
korkenbroski - https//:twitch.tv/korkenbroski
Macrasse - https://twitch.tv/macrasse
KantoCast - https://twitch.tv/kantocast