Wall tech
From SmashWiki, the Super Smash Bros. wiki
The reason given for the merge is This is a variant of tech. (Discuss)
A wall tech is a tech against a wall. To wall tech, the player must press a shield button 20 frames or fewer before hitting the wall while tumbling, reeling, or in hitstun. 20 frames after each press is a 40 frame downtime window where a wall tech cannot be done, so button mashing reduces the player's likelihood of teching. As with normal techs, the wall teching character experiences a few invincibility frames, and the tech absorbs the player's momentum.
[edit] Ledge tech
A recovering character can use a form of wall tech to survive an edge-guarder. If the recovering character is hit with an attack very near to the ledge, he or she can smash DI towards the ledge and wall tech to absorb all the knockback of the enemy's attack. This is usually performed by pressing the shield button to wall tech before pressing the control stick to DI, because of the 20 frame window in which the player can input the tech before hitting the wall.
[edit] Wall tech jump
If a jump input is active when a wall tech is performed (such as holding Up or pressing a jump button), then the teching character will wall jump. This is known as a wall tech jump. Though only certain characters can wall jump normally, every character can wall tech jump.
