Tech Check

A Tech Check is a technique that is mainly unique to Captain Falcon's Falcon Dive and Ganondorf's functionally similar Dark Dive. When either one of the two characters grabs his opponent near a ledge or wall of the stage with his respective up special, the opponent can wall jump tech the following explosion from the throw and punish him while he is stuck in the move's ending lag. This technique is controversial in the Captain Falcon and Ganondorf communities, with many players saying that it allows the opponent to punish them in a situation that is out of their control.
Tech Check exists in all Smash games as of Melee (as wall techs were not present in Smash 64). As of Ultimate patch 11.0.0, however, the endlag of both characters' throws have been significantly decreased, making the technique considerably harder, though it can still occur.
The technique was originally named Rockcrocking, named after the player of the same name, RockCrock. After RockCrock was falsely accused of sexual assault, however, Captain Falcon and Ganondorf players attempted to change the term to remove any reference to him. The new name was chosen on a Twitter poll created by Fatality, where "Tech Check" won the poll by a significant margin.[1]. Despite the pushing of the new term from prominent players, it has not been fully adopted, with many players still using "Rockcrocking".