16 shiny, i played for about 3-4 hours, highest cp gengar 2468, then traded maybe 50 gastly and got 9 lucky
when i was trading, i thought i had glitched the game and got 4 lucky pokemon in a row, so i traded zekrom for zekrom and got a 14/15/15, sadly my girlfriend didnt get such a good one.
the idea i had for newer players was to keep many gastly that they had traded for and when they use a lucky egg to get double friendship exp to evolve the gastly to haunter for 25 candy, and then evolve into gengars for free, but getting the exp doubled, ended up with the same cost of evolving 2 pokemon as a weedle/pidgy, but taking up half the space...