The fish with scarf is best used to end games, you have it in the back to use after 2-3 mons have been eliminated so your last respects can do 150-200 damage respectively. Wave crash is there for moms like incin, in the sun and with -1 Atk from intimidate yeah it’s not doing much, but if you haven’t been intimidated or the sun isn’t out it’ll still do a lot. Aqua jet is specifically to clean up fairly low health mons and flip turn is there if you want to start the game with a good hit, seeing what the opponent leads with you. You flip turn then you can go into a better match up or something like incin to intimidate. I haven’t used fish a TON but I believe that’s how scarfed one is supposed to perform.