i plan on using water spout ( I know, crazy right) in competitive battle. I most likely will run blastoise on a rain team and I'm debating on torrent or rain dish being better for blastoise. When I get too low , scald or water pulse as the alternative move will do more damage. However, hp gained by rain dish could prove pivotal in water spout damage.
I also really need rain dish squirtle regardless and will trade other HA pokemon for it.