Generation Iii
Magnet Pull
Traps STEEL-type POKéMON.
Detailed Effect
While this Pokémon is in battle, opposing Steel-type Pokémon cannot flee or switch out. Pokémon with Run Away can still flee. Pokémon can still switch out with the use of a move or item. Overworld: If the lead Pokémon has this ability, Steel-type Pokémon have a higher encounter rate.
Pokémon With Magnet Pull
9 canonical Pokémon forms can have this Ability.
Magnemite 
Magneton 
Nosepass 
Magnezone 
Probopass 
Meltan 
Alolan Geodude 
Alolan Graveler 
Alolan Golem