Kobebeans

Kobebeans from silver server. I traded with Stryyke and he attached a mount item onto a Sinnoh region pokemon. Didn't get a screenshot of the chat but here is a picture of the pokemon situation.

After finishing the fourth gym leader, I traded with someone who attached a mount onto a pokemon from the Sinnoh region and now I cannot access the pokemon at all because it is locked. Any tips on how to fix this problem?