Hey i was wonderin if the D16 motor will fit on the D15 tranny and if it does what will be the good and bad thing about it

Yes, it will have slower acceleration than if you used a d16z6 transmission. Other than that, it depends on exactly what d16 and d15 you're talking about; there are far more than just 1 of each.

would the d16a1 out of a 89 integra work with a d16z6 engine?

Almost all engine parts are swappable with other engines of the same letter. D and D, B and B, but not D and B. The trannys are usually swappable.