1. Hydro Pump: This is the most powerful Water-type move in the game, making it ideal for maximizing Gyarados's offensive potential. It has high power, but low accuracy, making it a risky move, especially against fast opponents.
2. Dragon Claw: This move provides Gyarados with a strong secondary typing. It's very powerful and has good accuracy, making it a reliable attack against Dragon and other types that resist Water.
3. Thunder: While Gyarados doesn't learn this move naturally, you can teach it via TM25. This move is essential for hitting Water-type Pokemon that would otherwise resist Hydro Pump and Dragon Claw.
4. Crunch: This move provides Gyarados with a powerful Dark-type attack, enabling it to hit Ghost-type Pokemon and other foes that might resist its Water and Dragon moves.
Note: This is not an exhaustive list, and other moves like Earthquake or Ice Fang can be useful depending on your team composition and specific opponents you face.
Consider:
* Your team's synergy: Choose moves that complement your other Pokemon's weaknesses.
* Opponent's weaknesses: Focus on moves that exploit the weaknesses of common opponents in the game.
* Type coverage: Ensure your moves provide good coverage against various types.
Good luck training your Gyarados!