Pokémon pearl -egg info trick
This is tricky! It’s quite helpful if you want to know the nature and the type of the pokemon inside the egg.
If you trade the egg to a friend, the nature will be different! If you hatch it in your own game, the nature is the same.
I’ve tested it on daimond & pearl. So I don’t know it this works on platinum too.
The info of the egg I saw:
Water/Rock
Careful
I didn’t time it right for the ability but it has Rock Head
To time it right: wait 3 seconds and switch quickly to the egg you want to see the info of.