Kid Buu tried to use an attack that looked like his transmutation beam against SSJ3 Goku. I say "looked like" because Goku dodged so we can't be 100% sure what that move would do, but its the only move Buu had that looked like that.
Also, I will reiterate that Goku's statements with regards to Fusion being insufficient to fighting Bills was about the Fusion Dance, not the even stronger Potara Fusion. Even on the off chance that SSJ3 Gogeta had been as strong or even slightly stronger than Bills, he'd still have next to no chance of beating Bills because he'd automatically de-fuse after 5 minutes in SSJ3 mode, whereas the Potara Fusion is said to be even stronger than the Dance-based Fusion, and has no time limit.
I'm not saying that Vegetto would necessarily stand a chance, only that Goku can't have been referring to him when he talked about Fusion being useless since he no longer has access to turning into Vegetto unless he robs whichever surviving Kaioushin still has the earrings, I guess.
And Munchy, Goku killed Yakon as well. Or at least, tricked him into blowing himself up by shoving a ton of "light energy" down his gullet by going SSJ2 while the guy was already draining his SSJ1 light.
We don't know that. Goku when referring specifically to the dance uses the English word "fusion", whereas in BoG he used the more general term for "merge", which encapsulates both the dance and the potaras. Plus Vegetto is the only canonical reference he has to a merger with Vegeta, as Gogeta was only in the movies.
https://www.youtube.com/watch?v=XNqq2YcyZ8U
Enjoy the fights!
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