I want to max a 10/11/12 mewtwo. Advise not to?

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Shiny Mewtwo Dynamax Adventure Hunt - SHINY AT 45 - Pokemon Sword and Shield

Ok, is there any way to level up Mewtwo fast because this just seems.. a bit too much : r/pokemongo

Lucario Cute Snorlax Mewtwo Clear Case for iPhone 14 Pro Max 8 6 7 Plus 11 12Pro SE 2020 XR XS 13 mini X XS Max Silicone Cover - AliExpress

Lucario Cute Snorlax Mewtwo Clear Case for iPhone 14 Pro Max 8 6 7 Plus 11 12Pro SE 2020 XR XS 13 mini X XS Max Silicone Cover - AliExpress

Shadow Mewtwo is 54148 CP, Same as Regular Mewtwo : r/TheSilphRoad

Mewtwo Strikes Back! Mewtwo VSTAR in Standard

Overseas Pokemon Center Limited Pokemon Charmander Relaxing River Figure Ⓒ

Pokemon 5e PHB Gen I - VII, PDF, Pokémon

Is my mewtwo good? : r/PokemonSwordAndShield

Mewtwo Max Level Challenge - Items Galore : r/PokemonShuffle