There are several options:
-Walk around with your Pokemon in your party. The more time you spend walking with them, the happier they get.
-Battle with them (but don't make them faint!)
-Grooming services. In diamond and pearl (and platinum), there are grooming services at the resort area. In HG/SS, grooming can be found in pallet town (with daisy in the afternoons), and in Golden Rod underground
level it up at day
You'll have to make Togepi happy to high happiness/friendship.
You can make it happy by treating it to spa.
You can make it happy by training it a whole lot. usually it takes a Pokemon 20-30 LVs to be fully happy.
It means that your Pokemon had Pokerus.
you have to run around with it lots. also battle with it. those two things make Pokemon happy.
Yes but it shouldn't make you happy.
Just use them alot in battle and give them good berries and that should make them happy
It has to be happy to evolve. I don't know how to get it happy. Sorry
Buy him a pokemon game
The way I do it is by giving the Pokemon you want happy a sooth bell, this will make the Pokemon grow happy fast. Then every day give the Pokemon a message at Veliston (spelling?). Also make sure that it's the first Pokemon in your party and never put in the PC boxes.
use sunny day