Best gym defenders and movesets

#	Pokémon	Moveset	Quick move	Main move	Rating
1	Blissey	Zen Headbutt Dazzling Gleam	Zen Headbutt	Dazzling Gleam	100
2	Rhyperior	Mud-Slap Rock Wrecker	Mud-Slap	Rock Wrecker Elite TM	86
3	Ursaluna	Rock Smash Play Rough	Rock Smash	Play Rough	83
4	Garchomp	Dragon Tail Outrage	Dragon Tail	Outrage	82
5	Avalugg	Ice Fang Avalanche	Ice Fang	Avalanche	82
6	Snorlax	Zen Headbutt Outrage	Zen Headbutt	Outrage	81
7	Dondozo	Waterfall Liquidation	Waterfall	Liquidation	79
8	Hisuian Avalugg	Powder Snow Rock Slide	Powder Snow	Rock Slide	79
9	Tyranitar	Smack Down Brutal Swing	Smack Down	Brutal Swing Elite TM	79
10	Metagross	Bullet Punch Meteor Mash	Bullet Punch	Meteor Mash Elite TM	78
11	Hisuian Goodra	Dragon Tail Draco Meteor	Dragon Tail	Draco Meteor	77
12	Kingambit	Snarl Dark Pulse	Snarl	Dark Pulse	77
13	Melmetal	Thunder Shock Double Iron Bash	Thunder Shock	Double Iron Bash Elite TM	76
14	Slaking	Yawn Hyper Beam	Yawn	Hyper Beam	76
15	Dragonite	Dragon Tail Outrage	Dragon Tail	Outrage	75
16	Hydrapple	Rollout Outrage	Rollout	Outrage	74
17	Togekiss	Charm Dazzling Gleam	Charm	Dazzling Gleam	74
18	Skeledirge	Incinerate Blast Burn	Incinerate	Blast Burn Elite TM	74
19	Hippowdon	Ice Fang Earth Power	Ice Fang	Earth Power	73
20	Baxcalibur	Ice Fang Glaive Rush	Ice Fang	Glaive Rush Elite TM	73
21	Sylveon	Charm Dazzling Gleam	Charm	Dazzling Gleam	72
22	Annihilape	Counter Shadow Ball	Counter	Shadow Ball	72
23	Goodra	Dragon Breath Draco Meteor	Dragon Breath	Draco Meteor	71
24	Florges (Blue Flower)	Fairy Wind Psychic	Fairy Wind	Psychic	71
25	Florges (Orange Flower)	Fairy Wind Psychic	Fairy Wind	Psychic	71
26	Florges (Red Flower)	Fairy Wind Psychic	Fairy Wind	Psychic	71
27	Florges (White Flower)	Fairy Wind Psychic	Fairy Wind	Psychic	71
28	Florges (Yellow Flower)	Fairy Wind Psychic	Fairy Wind	Psychic	71
29	Kommo-o	Dragon Tail Boomburst	Dragon Tail	Boomburst	70
30	Lapras	Ice Shard Sparkling Aria	Ice Shard	Sparkling Aria Elite TM	70
31	Milotic	Waterfall Hyper Beam	Waterfall	Hyper Beam	69
32	Cetitan	Powder Snow Avalanche	Powder Snow	Avalanche	68
33	Gholdengo	Hex Shadow Ball	Hex	Shadow Ball	68
34	Torterra	Mud-Slap Frenzy Plant	Mud-Slap	Frenzy Plant Elite TM	68
35	Salamence	Dragon Tail Outrage	Dragon Tail	Outrage Elite TM	68
36	Rhydon	Mud-Slap Earthquake	Mud-Slap	Earthquake	68
37	Volcarona	Fire Spin Bug Buzz	Fire Spin	Bug Buzz	67
38	Gigalith	Mud-Slap Meteor Beam	Mud-Slap	Meteor Beam Elite TM	67
39	Aggron	Iron Tail Meteor Beam	Iron Tail	Meteor Beam	67
40	Garganacl	Smack Down Ancient Power	Smack Down	Ancient Power	67
41	Rillaboom	Razor Leaf Drum Beating	Razor Leaf	Drum Beating	67
42	Gyarados	Waterfall Outrage	Waterfall	Outrage	67
43	Primarina	Charm Sparkling Aria	Charm	Sparkling Aria	66
44	Armarouge	Incinerate Flamethrower	Incinerate	Flamethrower	66
45	Stonjourner	Rock Throw Rock Slide	Rock Throw	Rock Slide	66
46	Tangrowth	Infestation Power Whip	Infestation	Power Whip	66
47	Mudsdale	Mud-Slap Earthquake	Mud-Slap	Earthquake	65
48	Golisopod	Waterfall Liquidation	Waterfall	Liquidation	65
49	Conkeldurr	Force Palm Dynamic Punch	Force Palm	Dynamic Punch	65
50	Incineroar	Snarl Blast Burn	Snarl	Blast Burn Elite TM	65

Each Pokémon is scored at level 40 with perfect IVs as HP × Defense × (Attack × defending DPS)^¼, so bulk carries most of the score. Its rating is out of 100 for the top defender. Type matchups and motivation loss aren't counted.

Which Pokémon hold a gym best, ranked mostly by their bulk (HP and Defense) with some weight on the damage they deal, and the moveset each one defends best with. Legendary, Mythical and Mega Pokémon can't be placed in a gym, so they aren't listed.