Basically, complete all cups in all sports (+ sports mix), plus one exhibition game on every stage in every sport, and finally win every party game. Probbably like a 100%

I thought the 100% for this game was Gold%?

This would not make any sense to add because it's basically any% or gold% with a couple of extra steps which would not on its own be good enough for a category.

Gold% is not a full game 100% category to begin with. It's the 100% of the campaign part of the game. 100% of this game would be unlocking all characters for every single game and difficulty while unlocking all courts. This has come up in the past and probably will not get added until somebody gets a full run out which would take upwards of 18-20 hours.