SSJ4 Vegito

Here's how I figured it: SSJ Kid Goku only lost to the Final Form Rilldo when he was turned into Metal where as in Hand to Hand combat they were even (More or less) So I'd say SSJ Kid Goku is around SSJ Gotenks (Post-Rosat) since I feel that the SSJ2 transformation is much more of a power up from SSJ then a SSJ3 is from a SSJ2. Since Gotenks didn't reach SSJ2 as far as I see. So I see SSJ2 Kid Goku as a pretty decent Margin ahead of SSJ3 Gotenks. I'd place him a little stronger than Mystic Gohan, so than SSJ3 is around 2.5 too 3 times stronger than a SSJ2 so that would place SSJ3 Goku (1st appearence) somewhat stronger than Gohan Buu and since Baby Vegeta is more or less at that level (Since Goku was excited about fighting him) I'd say Baby Vegeta could do it.