if you can just state in good english what you really want, well then maybe we can give you the right answers you are looking for.
If you do Negative SEO for your competitor website, then it might bounced back for your website (if competitor knows negative seo)
Better try doing SEO for your website and beat your competitor, IF you can't beat up him but atlast your website at #2.. If you try negative SEO, then it affects both (you + competitor - no where results / penalized)..
Think twice, thrice & leave your thoughts about negative SEO
Cheers!
Bart