You didn't say which, but I read you. Wallace and Juan both seem nice and polite so I'm sure you will be happy working there. You also have a beautiful city to live in at Sootopolis. Good luck my friend as a water pokemon trainer. I'll try to come up with a tougher choice next time!
If the crossed out answer is still viable than I pick Meowth!
I think I asked this one before in off-topic but not here.
Lose Pokemon you have ever had in every game and be forced to start over recollecting with nothing or keep all of the Pokemon you have but never catch, breed or receive another new pokemon ever.