Fox's waveshine in Melee is an advanced technique that requires considerable technical skill to perform.
The DACUS is a well-known advanced technique in Brawl.
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An advanced technique is a series of actions, typically complex and/or difficult enough to require reasonable tech skill, that results in a benefit to the metagame of a character.

Advanced techniques mainly differ from standard techniques in that their presence was not discovered or expected by the game's designers. This often manifests itself in the form of advanced techniques being results of oversights or glitches, such as wavedashing and momentum cancelling. In the broader context of video games in general, their use is an example of what is known as emergent gameplay. A strong or properly-applied advanced technique can radically alter a character's metagame - for example, the short hop fast fall l-cancel provides a significant speed boost to a player's aerial assault and helps to patch up holes in slower characters' offenses. Certain characters rely heavily on their specific advanced techniques, such as the Ice Climbers' chain grabs and desynching techniques, and Fox's waveshine combos in Melee. Reliance of these "exploits" to shape top-level metagames is a common source of discontent among new and casual players.

List of advanced techniques

A list of techniques that are notably difficult to perform/require precise technical skill.

Name SSB SSBM SSBB SSB4 SSBU
Attack cancel short hop aerial          
Autolanding          
B-reversing          
Bat dropping          
Bidou          
Boost grab          
C-Bouncing          
Chain grab          
COIL          
Dash attack cancelled up smash          
Dash cancel          
Dash pivot cancel          
Dash-dancing          
Directional influence          
Drop cancel          
Edge dashing          
Edge hopping          
Fox-trotting          
Frame cancelling          
Glide toss          
Hilldash          
Jab cancel          
Jab reset          
Jump cancel throw          
Jump-canceled grab          
Jump-cancelling          
L-cancelling          
Ledge-cancelling          
Ledge DI          
Jab cancel          
Lock          
Mindgame          
Momentum cancelling          
Momentum slide          
Moonwalk          
Powershield          
Pivoting          
Platform cancel          
Power shield canceling          
Reverse aerial rush          
Shield break combo          
Shield platform dropping          
Shield-stop          
Short hop air dodge          
Short hop fast fall l-cancel          
Slingshot          
Smash directional influence          
Stage humping          
Step dashing          
Sticky edge jump          
Taunt cancelling          
Team wobble          
Teching          
Tech-chasing          
Teleport          
V-cancelling          
Wall jump cancel ledge grab          
Wavedash          
Zero-to-death combo          

List of character-specific advanced techniques

A list of advanced techniques that can only be performed by one or a few characters.

Mario

Link

Samus

Yoshi

Fox

Pikachu

Luigi

Ness

Captain Falcon

Peach

Bowser

Ice Climbers

Sheik

Zelda

Dr. Mario

Falco

Marth

Young Link

Ganondorf

Mewtwo

Roy

Mr. Game & Watch

Meta Knight

Pit

Zero Suit Samus

Wario

Pokémon Trainer

Squirtle

Charizard

Diddy Kong

Lucas

Sonic

Olimar

R.O.B.

Toon Link

Villager

Mega Man

Wii Fit Trainer

Rosalina and Luma

Pac-Man

Robin

Shulk

Ryu / Ken

Cloud

Simon/Richter

King K. Rool

Isabelle

Piranha Plant

Joker

Banjo & Kazooie

Terry

Steve

Pyra / Mythra

Kazuya