Mask
Lanturn
Delibird
Blaziken
Blaziken-Mega
Zigzagoon
Zigzagoon-Galar
Ludicolo
Seedot
Nuzleaf
Shiftry
Masquerain-(This one is Perfect)
Ninjask
Duskull
Torterra
Infernape
Empoleon-(This one works well too)
Bidoof
Bibarel
Roserade-(This one is Perfect)
Riolu
Lucario
Lucario-Mega
Electivire
Magmortar
Mamoswine
Froslass
Patrat
Unfezant-(This one is Perfect)
Sandile
Krokorok
Krookodile
Darumaka
Darumaka-Galar
Darmanitan
Yamask
Carracosta
Greninja
Spritzee
Aromatisse
Clawitzer
Hawlucha
Crabominable
Thievul-(This one is Perfect)
Clobbopus
Grapploct
Impidimp
Eiscue-(This one works well too)
Ogerpon
Similar to a Mask
Cubone
Marowak
Hoothoot
Noctowl
Cacturne
Shuppet
Banette
Relicanth
Metagross
The Regi's
Starly
Stravia
Staraptor
Luxio
Luxray
Shieldon
Bastiodon
Yanmega
Liepard
I was pretty open as to what I called a "mask". This is a list so you can go through and pick your favorite Pokemon that fits the description.
Source: Nat Dex Page on Pokemon Database
Hope I Helped!