Celadon City: Pokéballs

Celadon City - Gym Leader Erika - Team Rocket Hideout - Pokemon: Let's Go, Pikachu! Guide - IGN

No pokeballs challenge complete! Took only 4 hours : r/PokemonFireRed

Rocket Game Corner, Pokemon Planet Wikia

Celadon City Department Store - Pokemon World Online Wiki

Celadon City - Gym Leader Erika - Team Rocket Hideout - Pokemon: Let's Go, Pikachu! Guide - IGN

How to Get to Celadon City in Pokémon FireRed (with Pictures)

Celadon Mall, Dorkly's Pokemon Rusty Wiki

Route 7 - Pokemon Red Version Walkthrough & Guide - GameFAQs

Celadon City - Gym Leader Erika - Team Rocket Hideout - Pokemon: Let's Go, Pikachu! Guide - IGN

Pokemon Fire Red Walkthrough - Part 10 - Pokemon Tower and Celadon City!

Pokémon Let's Go Rocket Game Corner and Team Rocket Hideout - available Pokémon, items and trainers

Celadon City, Pokémon Infinite Fusion Wiki

Celadon Department Store - Bulbapedia, the community-driven Pokémon encyclopedia

Celadon City - Gym Leader Erika - Team Rocket Hideout - Pokemon: Let's Go, Pikachu! Guide - IGN