May 24, 2018, 04:05:02 am
(↑ Back to the AttackDex index.)
TM21 is a (variable name) (0x28)-type glitch move in Pokémon Yellow. It is not capable of causing Super Glitch.
Successfully using this glitch move may deal damage with Hydro Pump's animation, but freeze the game afterwards if it does not knock out the opponent.