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Spikes

Type	Power	Accuracy	PP	Priority	Damage	Target
Ground	-	-	20	0	-	Enemy field

Does 12.5% damage with one layer, 16.67% damage with two layers, and 25% damage with three layers to the enemy when they switch in a new Pokémon. Is removed from opponent's side of the field when they use Rapid Spin. Only grounded Pokemon are affected. Hits through Wonder Guard.

Grounded Pokemon are Pokemon that are not part Flying, do not have Ingrain active, do not have the ability Levitate, and do not have Magnet Rise active. If Gravity is active, all Pokemon are grounded. All Pokemon holding an Iron Ball are grounded.

Smogon has an article on this topic.

Pokémon	Type	Tier	Abilities	HP	Atk	Def	SpA	SpD	Spe	BST
Budew	Grass / Poison	LC	Natural Cure / Poison Point	40	30	35	50	70	55	280
Cacnea	Grass	LC	Sand Veil	50	85	40	85	40	35	335
Cacturne	Grass / Dark	NU	Sand Veil	70	115	60	115	60	55	475
Cloyster	Water / Ice	UU	Shell Armor / Skill Link	50	95	180	85	45	70	525
Deoxys	Psychic	Uber	Pressure	50	150	50	150	50	150	600
Deoxys-A	Psychic	Uber	Pressure	50	180	20	180	20	150	600
Deoxys-D	Psychic	Uber	Pressure	50	70	160	70	160	90	600
Deoxys-S	Psychic	Uber	Pressure	50	95	90	95	90	180	600
Forretress	Bug / Steel	OU	Sturdy	75	90	140	60	60	40	465
Froslass	Ice / Ghost	BL	Snow Cloak	70	80	70	80	70	110	480
Glalie	Ice	NU	Inner Focus / Ice Body	80	80	80	80	80	80	480
Omanyte	Rock / Water	LC	Swift Swim / Shell Armor	35	40	100	90	55	35	355
Omastar	Rock / Water	UU	Swift Swim / Shell Armor	70	60	125	115	70	55	495
Pineco	Bug	LC	Sturdy	50	65	90	35	35	15	290
Qwilfish	Water / Poison	UU	Swift Swim / Poison Point	65	95	75	55	55	85	430
Roselia	Grass / Poison	NU	Natural Cure / Poison Point	50	60	45	100	80	65	400
Roserade	Grass / Poison	OU	Natural Cure / Poison Point	60	70	55	125	105	90	505
Skarmory	Steel / Flying	OU	Sturdy / Keen Eye	65	80	140	40	70	70	465
Snorunt	Ice	LC	Inner Focus / Ice Body	50	50	50	50	50	50	300