Drain Punch:
* Pros: Excellent STAB (Same Type Attack Bonus) for Gallade's Fighting type, high power, and heals Gallade.
* Cons: Low accuracy, can be risky if you miss.
Leaf Blade:
* Pros: Very high power, covers a lot of common Pokémon like Water and Ground types.
* Cons: Not STAB, can be hard to predict when to use.
Psycho Cut:
* Pros: STAB for Gallade's Psychic type, high power, and high accuracy.
* Cons: Not as high power as Leaf Blade, can be resisted by Dark, Ghost, and Psychic types.
Night Slash:
* Pros: High power, high accuracy, can be useful for Dark-type coverage.
* Cons: Not STAB, can be resisted by Fighting and Ghost types.
General Strategy and Choice:
* Offensive Gallade: Drain Punch and Psycho Cut are likely your best choices here. Drain Punch gives you STAB and healing, while Psycho Cut provides high accuracy and another strong attack. Leaf Blade can be an option for coverage against Water and Ground types, but Night Slash is less useful against common Pokémon.
* Special Gallade: Since Gallade's Special Attack isn't as high as its Attack stat, this build is less common. However, if you're building a special Gallade, Leaf Blade can be useful for STAB, while Psycho Cut offers another strong Special Attack.
Overall:
All four moves are good choices for Gallade, but they all have strengths and weaknesses. The best choice ultimately depends on your specific strategy and playstyle. Consider the following factors:
* What types of Pokémon are you likely to encounter?
* What weaknesses do those Pokémon have?
* What moves do you want to cover?
Experiment with different movesets and find what works best for you!