There are LOADS of smiley faces the most famous is :-) and :-D. here are some of the ones I know of:
;-) :-) ;) :) XD X-D ;-D :-D ;D :D XP :P :-P ;-P ;P :-@ ;-@ :@ ;@ >:( ;-( :-( ;( :( :-S ;-S ;S :S :$ ;$ ;-$ :-$ ;-I :-I (the last two usually dont have the lines at the top and bottom of the I) 8-D 8D 8-) 8) :-3 ;-3 ;3 :3
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If you mean the little pixel smiley face, then you must be a volunteer for Ourworld.
Le shop
Scarface, Baby Face, Funnyface, Face/Off, The Man without a Face, Blue in the Face, Saving Face, A Face in the Crowd, Smiley Face, Der Fuehrer's Face
It means that that certain Pokemon had pokerus and is no longer able to get pokerus again
you can go on to their "ID PHONE" something like that and click on the smiley face and it will automatically send the request.