I noticed most Metagross lists play Alolan Vulpix, but I thought it would be better with Talonflame for multiple reasons. One reason would be obviously getting any cards I want from my deck and reason number two would be to soften up your opponent's pokemon and get the OHKO with Metagross-GX
Pokemon (17)
x4 Talonflame
x4 Beldum
x3 Metang
x4 Metagross-GX
x2 Tapu Lele-GX
Trainers (34)
x4 Ultra Ball
x4 VS Seeker
x4 Choice Band
x3 Rare Candy
x3 Max Potion
x2 Field Blower
x1 Rescue Stretcher
x4 Professor Sycanore
x3 N
x2 Lysandre
x1 Karen
x1 Brigette
x1 Hex Maniac
x1 Professor Kukui
Energy (9)
x8 Metal Energy
x1 Psychic Energy
Pokemon (17)
x4 Talonflame
x4 Beldum
x3 Metang
x4 Metagross-GX
x2 Tapu Lele-GX
Trainers (34)
x4 Ultra Ball
x4 VS Seeker
x4 Choice Band
x3 Rare Candy
x3 Max Potion
x2 Field Blower
x1 Rescue Stretcher
x4 Professor Sycanore
x3 N
x2 Lysandre
x1 Karen
x1 Brigette
x1 Hex Maniac
x1 Professor Kukui
Energy (9)
x8 Metal Energy
x1 Psychic Energy