On the first turn, the user will dive down for one turn and become invulnerable to most attacks, with the exception of Surf and Whirlpool, which will do twice the damage to the submerged Pokémon. The user can also be hit underwater if it was previously targeted by Lock-On or Mind Reader. Sandstorm, and Hail will not cause damage during the semi-invulnerable turn.
Pokémon cannot be caught during the semi-invulnerable stage of Dive.
The user may now be hit while underwater if it is attacked by a Pokémon with No Guard, or if the user has No Guard themselves.