Question

Do you gain hp if your pokemon has water absorb and it raining?

Answer 1

You get hp from water attack hitting you but not rain

Comments

Rain Dish is the ability that heals your pokemon when it's raining.

Answer 2

As,Rayquaza said,Pokemon with the ability Water Absorb
only get HP by being hit by a Water-Type move.
Rain Dish is the ability that will heal your Pokemon if it is raining.

Comments

Absolutely correct!^^