It means that that certain Pokemon had pokerus and is no longer able to get pokerus again
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Battle them for a long time and make it happy using massages etc. If you go to the pokemons summary, if there is a small yellow smiley face next to its picture, then it means that it is really happy. (This usually happens with your starter pokemon, but I'm sure if you try hard enough, you'll manage with others!) :)
You need to have seven badges and you need to beat Cyrus and face Giratina in the Torn World. To find out how to do that, look on www.psypokes.com and go on the Pokemon platinum walkthrough.
Yes, Pokemon platinum has all of the original 3 legendaries. You will face Giratina in the distortion world when you are with Master Cyrus and you will face palkia and dialga on the Spaer Pillar on top of the Mt. Coronet when you beat the entire game. You can face Giratina again in the Turnback cave just off the spring path close to lake valor.
If you mean the little pixel smiley face, then you must be a volunteer for Ourworld.