I know this is was asked a year and a half ago, but I figured this out.
In the 003_VOE_Event_Handlers.rb file on line 38 where it says:
pkmn = Pokemon.new(pkmn[0], pkmn[1])
change it to:
pkmn = pbGenerateWildPokemon(pkmn[0], pkmn[1])
Working for:
Voltseon's Overworld Encounters 2.0
Automatic...