Shadow Starmie

Shadow Starmie is here... but it's too little, too late. Sadly, this little jeweled star is not going to make any real waves, as it's competing in the Water and Psychic metas, both of which are way above its pay-grade. This thing can be nice when first starting out for its dual-type roll compression, but that's about where its genuine utility ends.

Best PvE Offensive Moveset

• Water Gun and Surf for Water damage
• Psywave and Psychic for Psychic damage
• If you get the right Hidden Power type, Ice Beam, Thunder, and Power Gem are usable, though not good.
• Tackle and Quick Attack are no-go.

Best PvE Defensive Moveset

• Hidden Power is the preferred fast move for its high defensive DPS and surprise typing factor.

• Psychic, Ice Beam, and Power Gem are Starmie’s only real usable defensive charge moves; the former has STAB and hits earlier.

• Psybeam is inferior to Psychic.

• Hydro Pump and Thunder hit hard and early, but Starmie is far too frail to use them on defense.

Water Gun offers the most consistent performance, and benefits from STAB. Hidden Power can surprise opponents with its unpredictable typing, but has poor energy generation. 

Psychic gets STAB and ties for the least energy cost among Starmie's charge moves. Ice Beam provides useful coverage, including against Starmie's weakness to Grass Pokemon, in addition to costing less energy than other options. Thunder offers superior damage compared to Power Gem, though neither are recommended due to greater energy demands and less preferable coverage for Starmie. Hydro Pump is powerful with STAB, but demands too much energy to use.