Mesprit

Mesprit has middling attack, middling defense, and middling stamina. While it's not necessarily terrible, it's not particularly exciting either. Higher Psychic-type DPS than Lugia, but lower than even Confusion/Psychic Gardevoir. If you have access to Alakazam or Espeon, I have a feeling you'll want to leave the Emotion Pokémon on the bench.

Best PvE Offensive Moveset

• Confusion is the superior fast move on offense.
• Extrasensory falls behind, but not by much. 
• Future Sight benefits from STAB and is Mesprit's highest DPS moveset.
• Blizzard lacks STAB and doesn't suit Mesprit's role. 
• Swift lacks STAB and can't be Super Effective vs anything.