You can't do that with PPRE...
By the way, use DSPRE it's better !
So...In order to modify headbutt tree pokemon in HGSS, you need to use nitroexplorer2, open your HGSS rom, go to data a/2/5/2 and export it.
Then open the file with crystal tile 2.
Each tree data is composed by 28 bytes, so 7 lines (4 bytes) :
line 1 : area address
line 2 : pokemon 1 (50%)
line 3 : pokemon 2 (15%)
line 4 : pokemon 3 (15%)
line 5 : pokemon 4 (10%)
line 6 : pokemon 5 (5%)
line 7 : pokemon 6 (5%)
You have 7 bytes for trees type 1 and 7 bytes for trees type 2 (and sometimes 7 bytes for special trees)
For each pokemon line is composed like that : XX XX YY ZZ
where XX XX is the HEX number of the pokemon and YY YY is the level range.
If you want some location for the roads : (route mean "road" in french)
- Offset 1130, 14 00 00 00 : route 1
- Offset 1360, 0F 00 00 00 : route 2
- Offset 1510, 04 00 00 00 : route 3
- Offset 15C0, 09 00 00 00 : route 4
- Offset 16E0, 04 00 00 00 : route 5
- Offset 1790, 06 00 00 00 : route 6
- Offset 1870, 08 00 00 00 : route 7
- Offset 1970, 05 00 00 00 : route 8
- Offset 1A40, 0B 00 00 00 : route 11
- Offset 1B90, 0A 00 00 00 : route 12
- Offset 1CD0, 0F 00 00 00 : route 13
- Offset 1E80, 03 00 00 00 : route 14
- Offset 1F20, 13 00 00 00 : route 15
- Offset 2130, 02 00 00 00 : route 16
- Offset 21B0, 03 00 00 00 : route 18
- Offset 2240, 07 00 00 00 : route 22
- Offset 2340, 0B 00 04 00 : route 25
- Offset 24F0, 11 00 00 00 : route 26
- Offset 26D0, 11 00 00 00 : route 27
- Offset 28B0, 0F 00 00 00 : route 28
- Offset 2A70, 23 00 00 00 : route 29
- Offset 2E00, 1E 00 00 00 : route 30
- Offset 3120, 0F 00 00 00 : route 31
- Offset 32D0, 23 00 00 00 : route 32
- Offset 3660, 04 00 00 00 : route 33
- Offset 3710, 0F 00 00 00 : route 34
- Offset 38C0, 0E 00 00 00 : route 35
- Offset 3A60, 1A 00 00 00 : route 36
- Offset 3D20, 0D 00 00 00 : route 37
- Offset 3EA0, 0D 00 00 00 : route 38
- Offset 4040, 03 00 00 00 : route 39
- Offset 40D0, 0A 00 00 00 : route 42
- Offset 4210, 11 00 00 00 : route 43
- Offset 43F0, 0E 00 00 00 : route 44
- Offset 4590, 03 00 00 00 : route 45
- Offset 4620, 0A 00 00 00 : route 46
Hope i't will help you^^