Gust

Harden

Haze

Harden increases your Pokémon's Defense statistic by an amount equal to one-half of its initial value. Thus, the first use of this attack results in 150% normal Defense. The second use results in double the normal Defense score, and so on. Effects are cumulative for a maximum of 6 uses, at which point your Pokémon's Defense will have reached quadruple the normal value. Further uses will have no effect.

Note that like other statistics, Defense has a maximum value of 999. If a use of this attack would raise your Pokémon's Defense beyond 999, it will instead raise it only to that value. If its Defense has already reached 999, this attack will fail.

Also note that since the attacker's Defense statistic is altered, only protection from Physical attacks, such as Swift and Dig, will be increased. No protection is afforded against damage caused by Special attacks like Psychic and Solarbeam.

For more information on the different kinds of attacks and how damage is determined for each of them, see the Attack Base Explanation.

Metapod
Kakuna
Geodude series
Grimer series
Onix
Krabby series
Staryu series
Pinsir
Kabuto series
Snorlax