I got "scammed"

A few days ago I finished the Hoenn Region and wanted to start Pvp and Selled some pokes (That I didnt Need). I got some offer for my Dragonair from "Xxchopperxx". I wrote to him and noticed that he didnt finished the Elite 4 of Kanto, so he couldnt take the Dragonair because it´s Johto. He was sad of it and I asked him if he Need help with Elite 4. I gave him my Gengar my Umbreon, Charizard and my Golduck (All lvl 80-90 except Charizard was near 70). He didnt got the League 5 times in a row. He said that he Need to go off because he wanted to sleep, so I took the Pokes from him and the next day he started again. As he was in the fight I was farming a poke, after few minutes I noticed that he was off...with my Pokemon.

And now, everytime I go on he is instantly offline. And unfortunately I got no evidence about it. I just got his Name in my friendlist.

I hope that anyone can help me with that.

If not thanks for taking the time to read this. :Exclam:

If it does help my Pokemon also got Items:

Gengar -> Quick Claw

Umbreon -> Dark Glasses

Golduck -> (Spoon that boosts Psychic moves)

Syberkitt :thanks: