In Pokemon Black and White you can use your X-transmitter to contact Bianca that will tell you how happy your Pokemon. Certain items and getting your Pokemon a massage will help to increase its happiness.
In some Pokemon games a certain person will tell you how happy your Pokemon is you can tell yourself when you use an item on your Pokemon the closer they get to the screen the more happy they are.
On the beach (route 213) you have a house, the house of dr. Footstep. Enter that house, with the Pokemon you want to rate as first Pokemon in your team. If your Pokemon are happy with you, he will give them a Footstep Ribbon.
Pokemon get happier this way:
-Walk much with them (the Pokemon should be the first Pokemon in your team
-Level the Pokemon up, very much
-Win fights with the Pokemon
-In Veilstone City, near the Gym, there is a house. The girl in one of the houses will give your Pokemon a massage. Note: you can only take the masssage once a day.
I hope this helped.
Easly
One of the Pokeetches might tell you.
Just simply talk to it and it will tell you how it feels. To talk to a pokemon, just turn to it and press A.
you talk to the pokemon that is folowing you than it will tell you wether it is happy or not
talk to its and sometimes it does a happy face but it depends which place your in
You go to Daisy in your home town, after some grooming of ur Pokemon she will tell you how much it likes you.
you have to get a poke app . it shows your pokemons happiness in hearts
A person somewhere in the game will tell you how happy your Pokemon is if you show it to that person also if you use an item on your Pokemon the closer they get to the screen the more happy they are.
you tell him everybody happy and wifi connection.
In certain Pokemon games a person will tell you your Pokemon's happines. Others you have to use an item on it and find out yourself.
You have to type in "PAttyPete"
If you turn around and talk to your Pokemon you can tell what your Pokemon are doing and if they are happy.