I've been meaning to use this, but like others I wanted to run a Hydration/Rest combo with DD and couldn't find a decent type that paired with Water (since using Ground STAB gets no benefit from Rain) until I seen that it learns Thrash. Normal/ Water is walled by exactly 7 fully evolved Pokemon, 2 of which are Uber (Dialga and Giratina), and 3 of which are likely to be OU/in a different tier than Whiscash (Nattorei, Burungeru and Empoleon), leaving exactly 2 Pokemon in the lower tiers that walls it, Cradily and Shedinja.
I think that its possibly the best answer to Whiscash's coverage problems. Granted, being locked into the move isn't ideal, but Whiscash is actually more of an ideal user of it than others thanks to the bulk afforded Whiscash by Hydration/Rest and its typing, it can easily survive if something than resists comes in until the move has run its course and rest off the damage and confusion.
EDIT: Seems like I missed the entire "Water/ Normal is the best option" discussion on the last page :( Oh well, Return is probably better, unless you really need the extra 18 BP afforded by Thrash to kill something...
I think that its possibly the best answer to Whiscash's coverage problems. Granted, being locked into the move isn't ideal, but Whiscash is actually more of an ideal user of it than others thanks to the bulk afforded Whiscash by Hydration/Rest and its typing, it can easily survive if something than resists comes in until the move has run its course and rest off the damage and confusion.
EDIT: Seems like I missed the entire "Water/ Normal is the best option" discussion on the last page :( Oh well, Return is probably better, unless you really need the extra 18 BP afforded by Thrash to kill something...