I would recommend a cave because of the Zubats and Golbats. Mt. Coronet also works because of the Machops, Machokes, Zubats and Golbats. :)
Psycic type Pokemon are weak to Dark, Bug, Ghost moves and Pokemon. As an additional hint phycic type Pokemon do not do a single degree of damage to a dark type Pokemon by phycic attarks( unless of couse your oppenent made this possiple by using a move called miracle eye), its a move in Pokemon diamond, pearl, platinum.
Train Aron.
Train it to level 45.
Train it to Level 30
you have to train your girl kirlia
e1337 4
There are various good places to train flying types in Pokemon Platinum. A good thing to do would be to use the vs seeker.
victory road
Some people will argue with me but i think the best place to train is at the Pokemon lugue you can battle them over and over again
Same as other Pokemon u just Evolve it.
You have to train an Eevee by happiness at night
anywhere.