Most sites do not provide the finished .gba file to avoid copyright takedowns. Instead, they provide a Patch File (usually .ips or .ups). You must combine this patch with a clean base ROM.
What you need:
How to Patch:
If you have spent hours searching for a GBA ROM of Pokémon X or Y, you have noticed that every link leads to either:
Technical Explanation: The GBA cartridge maximum size is 32 MB. Pokémon Y on the 3DS is approximately 1.7 GB. The GBA lacks the processing power, 3D graphics chip, and touch screen controls required for the original games. It is physically impossible for an "original" GBA version to exist. descargar pokemon xy original para gba en espa%C3%B1ol
Because your search includes "descargar original" (download original), malicious sites target you specifically. They know you will click anything.
Never download a file that:
Safe sites for Spanish ROM Hacks: