PokeGen has a character map (a graphical representation of all of the letters, numbers, and symbols that can be used in nicknames) for this reason. The link is in my signature.
I figured it out, by trial and error haha, I used the PokeGen to find the code for the letter which was (01D7) for the smiley face and then I inputted it where I put the exclamation mark at haha substituted it in x]
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