In Pokemon Diamond\Pearl, you go to the Veilstone City Gym.
In Pokemon Platinum, you go to the Hearthome City Gym.
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Eterna's gym leader can be found in the Eterna Gym After defeating the three trainers hiding in the trees inside the gym you can find the gym leader at the northern (upper) part of the gym.
go in between the trees
He will apear in Eterna city in the house right from the gym
To get a Chatot in Pearl you must travel to Eterna City. Once in Eterna City from there go to the big building next to the gym and trade a man a Buizel for Chatot.
You need to have won the forest badge, by defeating gardinia in the eterna city gym, then go to the Galactic HQ in eterna city, and she wil give it to you You must have the eterna badge to use it though