Dex Entires
One of the ancient and long-since-extinct Pokémon that have been regenerated from fossils by people. If attacked by an enemy, it withdraws itself inside its hard shell.
Omanyte
Route 102
Ralts
Beldum
Mineral
Greninja
Protean
May be derived from dumbbell, a small weight used in weight training.
Beldum
Generations of kings were attended by these Pokémon, which used their spectral power to manipulate and control people and Pokémon.
Aegislash
Route 11, Friend Safari
Dedenne
Charmander
Monster and Dragon
Torkoal
Shell Armor
a combination of squirt (to spray) and turtle. The name was chosen in apparent reference to water guns, which were thought of as "cool" toys for children. "Squirt" is also a slang term for a small child.
Squirtle
Interlocking two bodies and spinning around generates the energy they need to live.
Klink
Route 3 (SOS Battle)
Salamence
Gyrados
Water 2 and Dragon
Gallade
Justified
may be a combination of the French words garde (guard) or garder (to guard) and devoir (duty), as well as voir (to see; referring to its Psychic powers).
Gardevoir
The leader, known as the brass, uses its extendible horn to issue orders to the others when it's time to change formation.
Falinks
Routes 10, 11, 15, 16, and 17, Akala Outskirts, Ancient Poni Path, Malie City, Poni Gauntlet, Poni Grove, Poni Plains, Poni Wilds, Tapu Village
Gumshoos
Snorunt
Fairy and Mineral
Metagross
Light Metal
may be derived from tyrant or Tyrannosaurus (both derived from the same root), and tar (alluding to the misconception of petroleum and tar originating from dinosaurs) or Reptar. It may also involve Tarasque.
Tyranitar
Its stress level rises if it cannot keep moving constantly. Too much stress makes it feel sick.
Vigoroth
Lake of Outrage
Axew's Eye, Rolling Fields (Max Raid Battle)
Dreepy
Machop
Human-like
Simisage
Overgrow
may be a combination of αρχή arkhé (Ancient Greek for origin and authority) or alpha and deus (Latin for god) or Zeus (king of the gods in Greek mythology).
Arceus