Okay so I have this dk box frame and I've been wanting to modify it to a full suspension frame, I've looked around a lot for some kind of kit or parts but haven't found anything . If there is really nothing out there I could always do it myself and I've had some ideas like a pivot point that attaches to the bb spline. Anyway any help would be nice thanks.

Why not just buy a full suspension frame thats designed to take 20" wheels? This here is a case of taking something very simple, over thinking it, and asking about a process that would completely destroy the frame.

The correct answer here is n+1. You'll have a BMX bike and a tiny MTB (although, why the hell would you want such a small full suspension bike? It almost defeats the purpose.)

Yes I have looked for some but they're all crap and I wanna use this for short dh mountain rides dirt jumps and skatepark haven't really found A nice medium

For DJ and skatepark, the answer is in the bike you already have. BMX. Full suspension would be awful in a park. And really, the frame would be so small as to be uncomfortable for downhill. And those tiny wheels wouldn't roll through obstacles/debris at all.

So like I said, the true answer is n+1, BMX for fun stuff, MTB for different fun stuff.

Really, the only "good" option here would be to find one of the late '90s Spooky frames with rear suspension. Can't say that I remember the name of the frame, but I definitely remember seeing it in Trend ads around '98 or '99.

Perhaps you want a full suspension Mountain bike by now .. save up a bunch of money..
Starting price: a good FS bike is over a Grand.

BMX racing is an up out of the saddle sprint over jumps and stuff,

your suspension has Shoes on the bottom of them... your legs..

Tru, guess ill have to save up for a hardtail.