Celadon City: Pokéballs

Celadon Game Corner - Pokemon Red Version Walkthrough & Guide - GameFAQs

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

Pokemon Let's Go, All Items Sold in Shop: List & Location

Pokemon Let's Go Pikachu - Part 20: Celadon City

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

Pokemon Let's go Pikachu! Celadon Department Store! TM's Galore and Evolution Stones!

Pokémon: Let's Go Takes Us Through Mt. Moon And Celadon City - Siliconera

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

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