Toxic Orb

Causes bad poison. (Hold)

Toxic Orb poisons your own Pokémon with bad poison at the end of each turn. That sounds terrible, but it's actually used strategically with abilities that benefit from status conditions.

A good use is with Poison Heal, which turns the poison damage into healing instead. Pokémon like Gliscor become incredibly tanky because they're healing every turn while being immune to other status conditions. Guts users can also benefit since poison triggers the Attack boost, but Flame Orb is usually better for that since burn damage doesn't snowball.