By leveling up:
* Water Gun: Level 1
* Water Pulse: Level 12
* Take Down: Level 21
* Amnesia: Level 30
* Brine: Level 39
* Surf: Level 48
* Hydro Pump: Level 57
* Body Slam: Level 66
By TM:
* Ice Beam: TM13
* Blizzard: TM14
* Thunderbolt: TM24
* Thunder: TM25
* Earthquake: TM26
* Mud-Slap: TM33
* Facade: TM37
* Protect: TM39
* Frustration: TM44
* Return: TM45
* Hidden Power: TM46
* Rock Tomb: TM48
* Aerial Ace: TM52
* Secret Power: TM53
* Shadow Claw: TM55
* Strength: TM56
* Sweet Scent: TM57
* Solarbeam: TM58
* Calm Mind: TM59
* Will-O-Wisp: TM67
* Substitute: TM69
* Bulk Up: TM70
* Taunt: TM71
* Reflect: TM72
* Light Screen: TM73
* Safeguard: TM74
* Pain Split: TM77
* Swagger: TM78
* Sleep Talk: TM80
* Skill Swap: TM81
* Spacial Rend: TM85
* Rock Slide: TM86
* Mud Bomb: TM87
* Recycle: TM91
* Iron Head: TM93
By breeding:
* Water Sport: Egg Move
By Tutor:
* Aqua Tail: Tutor
* Hydro Cannon: Tutor
Note: Some moves may be unavailable depending on the game's version or the trainer's choices. It is important to check the move list in-game for the most accurate information.