i think you should
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Muddy water,body slam,ice beam,surf
surf and muddy water have same power and ar both the same type, but.... Surf can be used OUT of battle to transport you as well as having 100 accuracy instead of 90 for muddy water. Muddy water has (i think) a different amount of PP, and may lower your foes accuracy. They both hit all foes (that havent evaded or had it miss them) in a single or double battle, and I'm pretty sure surf does 2X the normal damage against foes who have used dive and are underwater. overall.... i think Surf is more usefull than Muddy Water Hope i helped :)!
You can either catch a Shellos or you can find a Gastrodon in water areas I think.
Like any other Water type, Gastodon is extremely weak to Grass types like Torterra or Roserade. However, since Gastrodon is also part Ground type, it is resistant to Electric types, such as Raichu. So when you face a much-stronger-than-you Gastrodon, let loose on the Giga Drains.
u should keep brine because if a pokemon's HP is half or less brine's power doubles u should juz catch sum other water type and teach it surf