yes you need to get the 3 legenderies regice regirock and registeel which can be found on Pokemon emerald ruby and Sapphire
No
no nobody in Pokemon platinum have a doexys.
No sadly
I am sorry to say this but, you cant catch any of the Pokemon in platinum in ruby unless it is a hoenn Pokemon.
yes
there arent dark Pokemon in any Pokemon game.
Croconaw evolves at level 38, not by a stone.
yes it works with any diamond pearl or platinum game
No there are not. larson
yes
No
no