You did typo mistake.
The quote means optionnal parameter, don't add them.
The size should be :
<size> can be:
0 = medium (default)
1 = small
2 = big
and finally 2 friendly monsters don't attack each other but they attack the others (and they must be aggressive).
In your sample it should be something like that
1@prt_are01,0,0,0,0 monster Poring 1002,100,1,1,1,0,0
1@prt_are01,0,0,0,0 monster Poring 1002,100,1,1,1,1,1
1@prt_are01,0,0,0,0 monster Poring 1002,100,1,1,1,2,1