what is the xse script for:
geting a cubone lv 15 with pokerus,
in advance map (ruby)
how can you make a tree headbuttable?
what behavior byte do you use?
The cubone would require a little bit of ASM - have a look at:
For the headbutt trees, try asking zel as he made them in Shiny Gold, but I suppose it shouldn't be too hard to create a signpost script and put it on that or edit an unused behaviour byte (not too sure where they're stored though.