Should You Purify Shadow Mewtwo in 'Pokémon GO'?

Should you purify Shadow Mewtwo in 'Pokémon GO'? The Pokémon makes a comeback during November's "Team GO Rocket takeover" limited time event.

Shadow Mewtwo Pokemon GO Wiki - GamePress

How to Purify Shadow Pokemon in Pokemon GO

Pokemon Go Giovanni counters

If i purify Mewtwo, will it become 4*? If so, is there any reason not to purify Mewtwo? I've heard that shadow pokemon are better, but never understoo why. : r/pokemongo

Pokémon Shiny Mewtwo Shadow (Purify when T r a d e Go)- P T C with 80k+ Stardust – St. John's Institute (Hua Ming)

Pokemon Go Shadow Pokemon: battle counters to help catch and purify shadow Pokemon

Mewtwo (Pokémon GO) - Best Movesets, Counters, Evolutions and CP

shadow mewtwo For Sale - MAVIN

Is It Better To Purify Pokemon

No! You can't just purify Haha stardust go Shadow Mewtwo! bye bye! - iFunny

DON'T PURIFY SHADOW POKÉMON [SHADOW MEWTWO VS NORMAL MEWTWO POKÉMON GO] WHICH IS BETTER? DraculVlad

shadow mewtwo For Sale - MAVIN

Pokemon GO: The Best Shadow Pokemon For Raids