The First Chapter Starter Deck Emerald & Ruby Emerald Ruby has never really been a meta ink combination and perhaps this starter deck shows why
24 Spells Serum Visions Preordain Duress Fatal Push Vampiric Tutor Remand Arncane Denial Impulse Fire / Ice Into the Roil Baleful Strix Dreadbore Jace, Vryn's Prodigy / Snapcaster Talisman of Dominance Donate Harmless Offering Toxic Deluge Kolaghan's Command Dack Fayden / Daretti, Ingenious Iconoclast Demonic Pact Illusions of Grandeur Damnation Cryptic Command Force of Will 16 Lands The deck is pretty standard
More Answers Short answer: No
Darkness Pokmon thrive in corrupting or resisting mental attacks, while Metal types represent logic and defense, countering the fragile nature of psychic energy
If you're counting on Winged Sliver or Muscle Sliver or any other boost to carry you through combat, then a removal spell on the key ability can destroy your entire team, and even with Hibernation Sliver available such a blow is often crippling
It is rare for a deck to use only one color