Pinsur, Scyther have a High Avg.
Beedrill, Butterfree, Paras, Venonat are just Avg.
Caterpie, Kakuna, Metapod, Weedle are Low Avg.
(Before you finish the game)
Take into account of Level, HP, Shiny, etc, and the person with the biggest Avg wins.
Extra source: http://www.serebii.net/heartgoldsoulsilver/nationalpark.shtml
Hope this helps! •^-^•