There are four Pokemon — Diglett, Dugtrio, Nincada and Trapinch — that know the "Dig" move in "Pokemon Emerald." "Dig" is a Ground-type move first introduced in Generation 1 as "TM28."
When using the "Dig" move, the Pokemon digs a hole, pops in it, waits a single turn and then strikes at the next turn. Four Pokemon in "Pokemon Emerald" learn it naturally once they reach a certain level.
The Diglett and Dugtrio Pokemon will learn the Dig naturally at level 17. The Trapinch, on the other hand, will learn the move at level 41, while the Nincada will obtain it at level 45. There are also Pokemon that can learn Dig through breeding. These are Krabby, Kingler, Kabuto and Kabutops. Most Pokemon in "Pokemon Emerald" can learn the move by using "TM28."