>>54785094Facade is stronger than Blood Moon and doesn't have the drawback of only being usable once a turn. Ursaluna is also more min/maxed than Blood Moon and has better overall stats. Blood Moon has a way better ability and better overall movepool, but regular Ursaluna is better in every other way. That difference is what got Blood Moon banned in Smogon Singles while regular Ursaluna fell out of favor. Being able to set up and use Moonlight to heal is HUGE in Singles, but not so much in Doubles.
Also, Doubles has Flutter Mane everywhere, and Flutter Mane has a high SpD stat. Regular Ursaluna can OHKO Flutter Mane while Blood Moon can't. Earthquake is also better as STAB in Doubles than Earth Power, and every turn under trick room is vitally important, so wasting a turn on Blood Moon's recharge is crippling.