Tallgrass
TM46 Thief

TM46 Thief

Takes the target’s item.

Ruby
Slateport CityOceanic MuseumTeam Aqua Grunt
A grateful grunt hands you TM46 Thief.
Gift
Sapphire
Slateport CityOceanic MuseumTeam Aqua Grunt
A grateful grunt hands you TM46 Thief.
Gift
Emerald
Slateport CityOceanic Museum2FCaptain Stern
Return the stolen sub parts to Captain Stern (after the Aqua cutscene that plays out on the museum's 2F) and he hands you TM46 Thief - Dark, 60 power, steals the target's held item if the user isn't already holding one.
Gift