For music, you can find the value of those in A-maps Header section IIRC.
In XSE you can in setwildbattle write Name of Pokemon <For 252-276 placeholder you must write numers> And near Level in hex. Example. We need to create deoxys battle. Simple to write.
setwildbattle DEOXYS 100 NONE
And done. It creat for you Dexoys in Lvl 100 without Item.