If I want to pursue bodybuilding is a bbl or butt implants a good idea?

Both BBL and Butt Implants are an option.  Both have Pros and Cons.With Butt Implants, if you are very lean, they can look very fake!With the BBL, when you get very lean, your butt will shrink some.   However, the nice thing is that it will not shrink up to the size it would be right now if you were that same weight.   You don't make new fat cells, and they don't go away.   Therefore, if you transfer more of them to your buttocks, there will be a larger number of them there forever, and it will always be larger and any given weight than it would have been otherwise.   I would vote for the BBL as a much better option.  

If you are bodybuilding, then BBL will probably be better for you because the implants can possibly move or be seen which doesn't look good. However, if you are bodybuilding  you probably don't have much fat, so it would be hard to do the BBL. Possibly a small butt implant could be done. Be sure to consult with a surgeon with a lot experience in buttock enhancement and go from there.

You can pursue body building and have a BBL. It should not be a problem. You should consult with a Board Certified PS with extensive experience in performing buttock augmentation using fat transfer. Good  luck!