Officer Jenny
Like Nurse Joy, all the Jennys have a cult of being sisters and related in any way.
There's a Jenny in all City's (other Policeforces as well, but Jenny seems to be the boss), and all of them are very suspicius to most people, but they got Team Rocket only once (Butch and Cassidy twice).
The Jenny's have Growlithes (sometimes mistaken for Arcanines, see "A friend in deed"), and they can only be told apart by Brock, like the Joys. No more to be said.