If you are determined to play a Let's Go style game on a physical GBA console (Game Boy Advance SP, Game Boy Micro, or original GBA), follow this guide:
The Convergence of Nostalgia and Innovation: Pokémon Let's Go Pikachu GBA Pokémon Let's Go, Pikachu! Pokemon Lets Go Pikachu GBA
Pokémon: Let’s Go, Pikachu! – GBA Edition Release Year (imagined): 2005 (hypothetical Japan-only release) If you are determined to play a Let's