Any file claiming to be "Pokémon Sword and Shield for GBA" would be a (e.g., a modified version of Pokémon Ruby/Emerald with Sword/Shield graphics or names), not the real game. Downloading ROMs of copyrighted games (even hacks) is generally piracy unless you own the original cartridge and dump it yourself.
Would you like recommendations for official Pokémon games on GBA (like Ruby/Sapphire/Emerald or FireRed/LeafGreen ) that do exist in Spanish?
I notice you're looking to download Pokémon Sword and Shield for GBA in Spanish. However, I should clarify: were officially released only for Nintendo Switch in 2019. There is no official GBA version of these games.
