252+ SpA Choice Specs Mewtwo-Mega-Y Psycho Boost vs. 252 HP / 252+ SpD Giratina on a critical hit: 730-859 (103.6 - 122%) -- guaranteed OHKO
Thats in terrain with tina at 1.5 SpD and Chansey's HP.
You can kill a chansey tina with a non supereffective atk in an area it has a positive nature in ;_;
What is the world coming to