You can catch espurr in the Aqua Gang hideout , regardless if you joined or not. Also, Talonflame +gale wings + acrobatics + telluric seed works wonders against her. Just level fletchling to 39 without evolving to learn it.
I think there's some in Apophyll Beach. There might also be more in the rest of the cave not accessible from the power plant entrance, but that's not until much later.