Pokémon diamond question?

Question

what do the little smiley faces mean next to a pkmn picture when you summary?

Answer 1

Some mean the condition is Good, another means fainted, poisoned, paralyzed, etc.

Answer 2

It is a really good thing that happens to your Pokemon, almost randomly I think. It is a Virus that makes your Pokemon level up a whole lot faster, so you do not have to fight as much battles, it is one of the best things to happen to you in the Pokemon games. Put an infected Pokemon in a PC box, and it will infect the Pokemon in there as well.

Yes, this means your Pokemon are in great condition!!!