HM06 is a wrong pocket TM in Pokémon Gold. Its description is "Traps the foe for 2-5 turns.".
EffectHM06 turns on a PC like the one at the player's house, allowing the player to access/withdraw/deposit/toss stored items, and access stored mail and decorations.
This is much like the effects of TM31 and TM34 which also turn on PCs, but unlike TM34 there is no freeze or Glitch Dimension involved for closing the PC or any other action.
The main menu may appear glitched with a purple/black tint on the top-right corner of the screen. If the withdraw or toss menu is accessed immediately, it may appear with a green tint.
It is possible to change set up decorations but the changes are applied only in the player's room.