Hello @REDBRO16,
We have returned your Breloom back to your account. Do check and confirm you have received it back. Also, can you please tell us what for the Shroomish was traded to you by the said user?
In future issues with region-locked pokemons you may make a post in the following megathread:
https://pokemonrevolution.net/forum/topic/170765-region-locked-pokemon-megathread/
Cecillon's post in POKEMON LOCKED IN INVENTORY . was marked as the answer