A120. Perform (dance) covers all varieties of dance. You don't need anyone to teach it to you, you simply put ranks in it. However the DMG has optional rules on training where you may need downtime and/or gold to give to a trainer who teaches you the skills you gain when you level. Likewise there are fudge rules where if you put in your backstory or roleplay learning the dougie, the DM may choose to give you a +2 to bonus to perform (dance) checks related to the dougie.
This one is kinda sad because there are 3 rules for it and this really is how it works. Sad in that there are obscure rules for every tiny little thing and they aren't organized anywhere near each other. Covering everything is good I suppose. That they are obscure and on multiple different pages to address one 5 second comment by a player isn't good.