Can someone tell me how???

you need to use the xdelta patcher for asm hacks i think. if you're already using xdelta but it still won't work than i can't help you any further

If you're using code hacks (aka asm hacks) that use dirbaio's template (which i presume you are) you can more or less follow this guide for it, exept download this instead of the devkitPro download linked.

If youre using code hacks meant for NCPatcher and its template, see here.

Also, yes, there are xdelta patches made for people to let them use code hacks (particularly ones that required additional files added to the rom) more easily, but they dont really allow you to pick which code hacks you want to use specifically, nor use customized ones or ones you made yourself.