You can give the pokemon a Lucky Egg (which boosts exp gain by 20%), or simply face trainers and not wild pokemon, because trainers give out more exp.
No dude, lolz. Pokerus just makes EV/IV training A LOT easier.
use cheats
It helps you recruit Pokemon easier if you have more Friend Areas. Also, it helps if your Pokemon have a high enough level to make a good impression on wild Pokemon.
no buttons actually make it easier all it is is chance or if you have one a master ball will always catch but any pokemon fan knows that
You'll need to get the Action Replay and have the Pokemon Modifier to make it easier.
Lots of training & musicals.
training it.
to make jobs training easier xD from norlito ajero
You can make it happy by training it a whole lot. usually it takes a Pokemon 20-30 LVs to be fully happy.
The only way is to battle with it
Your dragon Pokemon has to love you, keep training it or give it rare candys
NO