Piccolo-Gohan fusion, can it be allowed in the Universal Tournament? In Dragon Ball Super episode 88th, according to some subtitles in a popular anime webpage, confirmed by Anime SE member Aki Tanaka who speaks japanese, Gohan literally says to Piccolo "If so, should we create a fusion technique, or combination (attack)?" . 

what does the original japanese audio says in episode 88th when Gohan is talking to Piccolo and asks him to do something in the battle together?

According to what's been said up to today about the Universal Tournament rules, could this be allowed?
With the introduction of Kefla, Fusion is definitely allowed, even with Potarra earrings. 

Techniques which causes fusion are definitely allowed, as seen in the example of Aniraza.