Can anyone give me a list of the ingame trades in Pokemon diamond version thanks?

I think that there are three in-game trades. One is a boy in Eterna city who trades you a Chatot for a Buizel. One is a woman in Snowpoint city who trades you a Haunter for a Medicham. One is a woman in Oreburgh where you trade a Machop for an Abra. actually 4. as far as i know. Theres a man on the water in a house that will trade his magikarp for a finneon. on route 226.