Sorry, I don't have screen shots of any chats- I closed everything before realising this thread existed, and just made an account here for this.
On Silver server, username Blemmigan.
I traded my Haunter to Gengar40 for their Graveler to evolve them- but didn't realise I wouldn't be able to evolve it or trade it back, as it's locked to Sinnoh.
The pokémon in question. (fixed link)
If it's impossible to get my Gengar back, then... well, hopefully it's possible to return the Graveler to its owner. Thank you! I'm very embarrassed.