There is no official mobile version of Super Mario Maker 2, as the game is a Nintendo Switch exclusive. "Mobile 3.0.0" downloads are illegitimate; the "3.0.0" designation refers to the 2020 final update that introduced World Maker, new power-ups, and the Koopalings, requiring an emulator or remote streaming to play on phones. For more details, visit Super Mario Maker 2 Wiki 3.0.0 | Super Mario Maker 2 Wiki | Fandom
Because no official app exists on the Google Play Store, you must rely on third-party sources. Follow this safe method. Super Mario Maker 2 Mobile 3.0.0 Download - Google