There are two ways to check a Pokemon's Happiness.
The first way is to go to the man who lives in the hut on the beach near Pastoria City. He will ask you to show him your Pokemon, and he will be able to determine your Pokemon's Happiness from it's footprints, and he will tell you afterwards.
The other way is to get the Poketch App from Eterna City. Go there, and go into the Pokemon Centre. There is a lady standing in the middle who will give you the Happiness Checker Poketch App. Find it in the Poketch (it is the one with all your party Pokemon moving randomly around the screen.) Get your stylus and put it on the Pokemon you wish to check. Push down, and the Pokemon will stop. If no hearts appear, it doesn't like you very much (this very rarely happens.) If one heart appears, it is relatively neutral, and doesn't love you nor dislike you. If two hearts appear, getting progressively bigger, it likes you quite a lot. If three hearts appear, with the last one being really big, your Pokemon is happy. This is really good, as you will be able to do Happiness evolutions and use the move Return.
If you wish to make your Pokemon happier, try giving it the Soothe Bell (given to you by one of the ladies in the Pokemon Mansion, south of Hearthome City) and use lots of Stat Items on it. There are also Berries which will make them more friendly, but they will lower the stats of your Pokemon, so these are not recommended. Other things that will make a Pokemon happier are levelling up, getting Pokemon massages from Veilstone City and the Resort Area, and simply by walking around. Please note that walking takes a long time (256 steps to go up one happiness level, about 300 happiness points need to be gained before it is happy.) Also, if you happen to have a Luxury Ball, try to catch a Pokemon in that and it will become happier more quickly.
when you talk to it if it has six hearts around it that means its at max happiness
Max out it's happiness.
In goldenrod, by the bike shop there is a house. Talk to the lady inside. She will say something like: Your Pokemon is still warming up to you (low happiness) Its quite cute (kinda low happiness) Seems to like you a little (kinda high happiness) It really Trusts you (Max happiness)
There is no Action Replay code to max happiness in Pokémon Diamond. You can easily max a Pokemon's happiness by feeding it berries and vitamins as well as giving it a soothe ball.
Selected Pokemon Has Max Happiness: 1206F04A 000020FF 1206F04E 00007338 Instructions: 1) Go to a PC 2) Select either "Deposit Pokemon" or "Move Pokemon" based on where the Pokemon you want max happiness is on. 3) Select the Pokemon 4) Pick "Marking" 5) And last, choose "Confirm" and the code should activate on the Pokemon.
when you talk to it if it has six hearts around it that means its at max happiness
there is no max. happiness lady in cianwood.
Train your Pokemon alot and use items on it as well.
Budew does evolve into Roselia which is when it is at max happiness and levels up. To max the happiness of a Pokemon having it on your team and winning battles with it is one method. Another method to max happiness is to find the NPC that will give your Pokemon a massage which sharply raises the Pokémon's happiness.
get a golbat and max out his happiness
Max out it's happiness.
In goldenrod, by the bike shop there is a house. Talk to the lady inside. She will say something like: Your Pokemon is still warming up to you (low happiness) Its quite cute (kinda low happiness) Seems to like you a little (kinda high happiness) It really Trusts you (Max happiness)
There is no Action Replay code to max happiness in Pokémon Diamond. You can easily max a Pokemon's happiness by feeding it berries and vitamins as well as giving it a soothe ball.
Selected Pokemon Has Max Happiness: 1206F04A 000020FF 1206F04E 00007338 Instructions: 1) Go to a PC 2) Select either "Deposit Pokemon" or "Move Pokemon" based on where the Pokemon you want max happiness is on. 3) Select the Pokemon 4) Pick "Marking" 5) And last, choose "Confirm" and the code should activate on the Pokemon.
Maxing out the happiness of a pokemon is somewhat time consuming. Walking around with the pokemon in the lead position will help slowly increase the happiness. You can also feed the pokemon poffins to help raise stats and happiness.
It evovles with max happiness
Happiness is gained by taking care of your pokemon giving it items, training it and many more things. Once it's happiness reaches the max happiness have it level up to evolve the pokemon.