Moved to appropriate sub forum
If you could tell us which server you play on, that would be great.
Also, have you tried using escape rope? relogging (closing the client completely)? or perhaps entering the rank PVP if you have your PVP team with you
When providing PVP-related reports, don't forget to make sure the evidence shows you battling inside a Pokecenter! (as these rules do not apply to non-ranked)