If you want the game that started it all during the Indigo League era:

For those who find emulation technically daunting or legally concerning, there are official alternatives that capture the Indigo League spirit. Niantic’s Pokémon GO remains a titan in the industry, rooted entirely in the original 151 Pokémon. While the gameplay is different from the turn-based RPG style of the Game Boy era, it allows players to catch the original roster in an augmented reality setting.

Never download .apk files promising "Pokémon Indigo League." Real GBA games only use .gba or .zip files. Executable Android files from unknown sites often contain malware.

Do you prefer or traditional gym-battles ?

: This is widely considered the most accurate recreation of the original anime. You play as Ash Ketchum, start with Pikachu, and encounter the exact same story beats, like meeting Misty after her bike is destroyed. How to Play : You will need a Game Boy Advance (GBA) emulator from the Play Store (such as Pokémon FireRed ROM to patch with the Ash Gray file. Pokémon Añil / Indigo (Fan Game) Description