Right so this time last week, no problems, now I'm doing the same thing and yet I'm either getting an "error, must turn off" message or I'm getting an egg which locks up my game if I check its summary.
So here's an example of a Cofagrigus I tried, to be as safe as possible, I don't get what would be making the game lock up when I was making Pokegen'd Japanese legendaries before..
PID: Left blank as usual
Species: Cofagrigus
Nickname: Left blank as usual
Experience: set to lvl50
Nature: Calm
Item: none
Happiness: 50 (random tbh)
Ability: Mummy
Country: US/UK/AU
Origin: Black
Gender: Male
Met..
Game: Black(2)/White(2)
Location: Relic Castle
Ball: Poke ball
Level: 34 (so legit for the wild encounter)
Date: 08/10/2012 (random)
Encounter: Egg/pal park (usual gen 5 option)
Egg is not ticked on either page
Stats: Mix of 31/30 IV's
EV's: 252 HP, 252 Sp.Att, 6 Def
Attacks: Nasty plot, shadow ball, will-o-wisp, hidden power
OT/misc...
Gender of trainer matches mine
using own trainer/secret ID (17662/44448)
OT: Joey (my name)
After this I get pokegen to make an ar code for selected pokemon (1). I put this on the AR, got a junk lead pokemon. Get the code activated, do L+R. Then I get an egg which crashes my game.
But as I say, last week I was making mons with a greater likelihood to go wrong, hell I picked the wrong encounter and stuff as I thought tall grass was standard, and it was still fine. So I don't get the issue?
EDIT: Just tried downloading a pkm file from pokecheck, this Aerodactyl, it also produced me this egg which crashes the game...
https://www.pokecheck.org/?p=detail&uid=7498260
pokecheck says it looks legit, so what's going on? Non-pokegen AR codes are working fine (tried 900 masterballs, all items etc).