TM028 (Japanese: わざマシン028Move Machine 028), known as TM28 prior to Generation IX, is a TM introduced in Generation I. It teaches a compatible Pokémon a move. The move it teaches depends on the game. For compatibility, refer to the move's page.
TMs in the Mystery Dungeon series are named only by the move they teach. For example, Attract is the item that teaches the move Attract. Most TMs, however, correspond to a TM in the core series' contemporaneous games.
In Rescue Team DX, TMs can only be used once. Whilst the available TMs are the same as those in Pokémon Sun and Moon, the TM list order is the same as for Super Mystery Dungeon (that is, in the TM order for Pokémon Omega Ruby and Alpha Sapphire), with newly added TMs added to the end of the list.
In games where Cinnabar Gym contains a quiz, the final question of that quiz asks whether TM28 contains a particular move, and proposes a nonexistent, humorously over-the-top move name that varies by language:
German: Frosch-AttackeRBYFRLG or HypermegasuperstrahlPE
Italian: Pietra Tombale
Spanish: Tumbapietra
Korean: 아야아야광선
Simplified Chinese: 死死光线 (international) or 倒地光线 (mainland China)
Traditional Chinese: 死死光線
In the Generation II games, there is a dummied-out copy of TM28, which appears in game data right after the real TM28. It is put in the Item pocket and has no effect. When held by a Pokémon, its name is displayed as Berry (Japanese: きのみ Berry). It shares these traits with TM04.
These dummy items might have been created to ensure that the correct item is held by a Pokémon traded from Generation I through the Time Capsule.
Along with TM21 and TM43, this is one of the few TMs unobtainable in both Colosseum and XD outside of trades.