I swear I have an odd idea about tsareena and that's that while it's a bully to most mons or people, it's suprisingly nice towards it's own trainer and their friends/mons.
not just in "she won't pick on you" kind of way, it's her team, the human is just the strategist and if you have a problem with any of them you gotta take it up with Her.
because of this I believe she'd be quite a common suggestion for trainers with a low self esteem.