Aerodactyl - you can find one in the vines at the Peril Cliffs
its altaria and its at the choroma ruins (after beating darkrai) for more information visit (www.serebii.net)
Altaria - you can find one at the entrance to the ruins
No
Darkrai
You can't have a Darkrai as your friend pokemon, I think, but the final boss at Altru Tower is a Darkrai.
Aerodactyl
Darkrai
A Quest on Boyleland after you've defeated Darkrai in Pokemon Ranger: Shadows of Almia.
in Pokemon ranger 2 i would say darkrai/heatran/garchomp/or charizard.
Manaphy and Darkrai.
darkrai doesn't have an event on pkmn ranger but as for pkmn platinum, perl, or dimond check serebii.
get past the rampodoses then there should be a tunnel go in it at the back is darkrai... by joel.g