Not sure on what is meant by "its", but...
To raise happines of any pokemon:
*Use Haircut Brothers (+10 to +1 depending on happines level and the Brother used)
*Level up (+5)
*Give vitamins (HP Up, Carbos, Zink etc)(+5)
*Groom @ Daisy (in Kanto) (+3)
*Don't use Herb medicine (-1 to -5 for various)
*Walk A LOT (+1 for every 256 steps)
*Don't faint (-1)
Max is 255.
Any level, just get it to max happiness.
evolve eevee into an umbreon by getting max happiness!
... evolves when leveld up in max happiness and morning
Riley from Iron Island will give you a Riolu egg. Hatch that, then max out its happiness.
he has to level up at max. happiness. he becomes happier by giviing it rare candies
there is no max. happiness lady in cianwood.
Just skipping one level with max happiness evolves these Pokémon
You make riolu have max happiness and then level it up
when you talk to it if it has six hearts around it that means its at max happiness
He evolves at any level with MAX happiness(you can check your poketech app, the one with hearts over your pokemon. 2 hearts=max happiness.). But, you must level him up with max happiness during the DAYTIME.
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.
max out its happiness