As for downloading the game for free via an ISO file, I must advise that:

Use community-made HD texture packs to modernize the visuals further. Finding the ISO: A Note on Safety

—developed by Genius Sonority—actually feel more dynamic. From Pokémon physically making contact during a Tackle to unique "faint" animations, it offers a cinematic experience that still feels premium today. Playing via Emulation: The Dolphin Emulator