I want to keep gaining coins and support candy for when the next league is released, but I'm worried that I won't be able to do league battles after I beat the last league. Obviously that will make it much harder to gain coins and trainer levels, so I'd rather retire my fish early and replay the last league repeatedly if that's the case. Specifically, I'm wondering the following questions:
Are there any league battles after you beat the final league? If so, are they as rewarding as the final league?
Will finishing the last league allow me to do battles that reward support candy and diamonds?
What happens when you beat the last league battle when your magikarp isn't at max level? Normally this lets you start the next league, but if there is no next league, that doesn't make sense.