QUOTE(501-Elite @ Mar 12 2018, 10:22 AM)
Focus Blast vs Shadow Ball ? Which is more powerful

Depend on what you use it for...
For raids especially mewtwo... shadow ball is useful since its one of the most powerful moves in the game. Even without STAB, Mewtwo atk stats of 300 is highest in the game.
But for gym, ghost type moves does only 0.7 to dark types and worse..only 0.5 to normal types so essentially they're being resisted by most gym defenders ex: Blissey, Snorlax, Chansey, Slaking, Tyranitar.
Purely as a move itself, Focus Blast is meh but:
Mewtwo resist psychic and take normal damage from dazzling gleam.
Machamp takes SE damage from zen headbutt and dazzling gleam
From my own testing, I find that psycho cut + focus blast takes out the same Blissey slightly faster than Machamp but have enough health left to also take out the next Snorlax and Tyranitar before dying.
Machamp will die before the Snorlax.