no although it looks like it when he powers up
No, because he was a kid throughout GT. He does go Super Saiyan as a kid.
Goku Vegeta Gogeta Vegito Gohan(and future Gohan)trunks(and future trunks)Goten Gotenks Broly Goku Jr. Vegeta Jr. and the original Super Saiyan
No. DragonBall Z Goku ascends to a SS3 and DragonBall GT Goku transforms into a SS4
Actually trunks mentioned that he has fused with goten susper saiyan 3 but it is never shown-ed he motion's it in the episode when vegeta and goku fuse super saiyan 4He can't. It seems that only pure blooded sayians can reach ssj4 since Goku, Vegeta and Gogeta were the only sayians to reach that form in Dragonball GT.
Yes during dragonball GT he does then does a fusion dance with goku
Goku turns super saiyan 4 in Dragon Ball GT Episode 35 (Goku's Ascension) Vegeta turns super saiyan 4 by bluts waves when fighting Omega Shenron in Dragon Ball GT Episode 59 (Super Saiyan 4 Vegeta)
Because it looks nothing like a super saiyan, large amount of people were unhappy with this and this resulted in DragonBall GT getting bad reviews.
None; Goku only turns into "level 4" in the DragonBall GT series.
Watch Dragonball GT Episode 34: Back in the Game is the start of it Watch Dragonball GT Episode 35: Gokus Ascension is when you will truly wikiness it
no, because Goten and Trunks never fuse in GT
When do you mean? If you are talking about just typically then yes, he did go super saiyan 4. He did mostly in Dragonball GT.
No, Goten was not shown having the ability to transform into super saiyan 4 over the case of DragonBall GT.