What is onix weak against?

Onix, a Rock/Ground type Pokémon, has several weaknesses.

1. Water type moves: Onix is quadruple weak against Water type moves, meaning that it takes four times the normal damage from these attacks. Water types such as Blastoise, Gyarados, and Lapras can easily exploit this weakness.

2. Grass type moves: Onix is weak against Grass type moves, taking twice the normal damage. Pokémon like Venusaur, Exeggutor, and Ludicolo can deal significant damage to Onix with their Grass type attacks.

3. Fighting type moves: Onix is also weak against Fighting type moves, taking double the normal damage. Fighting types such as Machamp, Hitmonlee, and Lucario can easily defeat Onix with their powerful Fighting type attacks.

4. Ground type moves: Although Onix is a Ground type Pokémon, it is not immune to Ground type moves. It takes double the normal damage from these attacks. Ground types like Garchomp, Flygon, and Excadrill can take advantage of Onix's weakness to Ground moves.

It is worth noting that Onix has a few resistances as well, primarily against Normal, Flying, Poison, and Electric type moves. However, its weaknesses to Water, Grass, Fighting, and Ground type moves make it vulnerable to certain Pokémon that can exploit these weaknesses effectively.