Shadow Probopass

In all of Pokemon Go's raid system, I can think of nose reason to use Shadow Probopass.

Best PvE Offensive Moveset

• Rock Throw gets STAB and pairs with Rock Slide to fulfill a Rock-type role. 
• Magnet Bomb is a slight downgrade, and doesn't synergize with either fast move as cleanly.
• Spark is an Electric-type without STAB, and pairs with Thunderbolt to fulfill a budget Electric role, but consider Electric Pokemon instead. 

Best PvE Defensive Moveset

• Rock Throw has much higher damage output on defense than Spark. 
• Magnet Bomb is the easiest to dodge, but can be used frequently as a 3-bar move.
• Rock Slide hits the hardest and is the most difficult to dodge, but is more likely to be resisted by attackers.
• Thunderbolt may threaten Water-type attackers, but gets walled by Ground-type attackers. 

Spark is useful for its fast energy generation, though its damage output is poor. Rock Throw sacrifices energy gains for much stronger STAB damage output, which can be useful for certain matchups. 

Rock Slide ties for the least amount of energy, benefits from STAB, and provides wide coverage. Thunderbolt is useful for its coverage against common Water-types and neutral damage against most other Steel-types, though it's demands a fair bit of energy and doesn't get STAB. Zap Cannon can deal a lethal blow if it lands (or debuff those it doesn't KO), but its energy cost is rather extreme. Magnet Bomb is an alternative move that benefits from STAB, but Steel-type coverage isn't particularly valuable against the meta.