Most "updated keys" found on random forums are deactivated within minutes or are just clickbait to get you to download suspicious files.
View a Pokémon's Individual Values (IVs) directly on the encounter screen before catching it.
If you're referring to a GPS spoofer, location spoofer, or another type of software, the use of such tools can have legal and ethical implications. For instance, in gaming, using spoofers to gain an unfair advantage can lead to account bans.