Happiness?

So I'm training a Golbat to become a Crobat, but I don't know where to gauge the Pokémon's happiness. Who do you need to talk with to do this?

 

In Jataro Region (Generation 2 Map) Do /spawn, then walk forward to the centre point where there is the Pokéstop and a fountain, from that point, walk up the stairs then turn left, you should be able to see the pier where there are some boats and an NPC which sails you to another city, when you are in the pier turn left and walk forward, now you should meet a bridge and just keep on following the path, it takes some time to get to the house where the NPC that checks happiness is.

 

@pixelmon3D check this out: http://forums.pokefind.co/index.php?threads/happiness-how-it-works-fixed.5622/