Here is The Arena's Viability Ranking of legendaries from OP Rank to F Rank. OP is the most useful choice on your team and F is not recommended. Only legendary monsters are covered in this ranking.
Disclaimer This list is based around monster's performance in The Arena [PvP], NOT Team Wars, Duels, etc. The monsters are ranked at Rank 5, and this list only takes into account the Legendary v. Legendary meta [mythics are not taken into account].
These monsters are too good for the SS+ tier, so they get their own special tier. By far the best legendaries in the entire game. It takes a lot of patience and time [and in most cases, real money] to get them.
Grakon
Santerion
Warmaster Ragnarok
Warmaster Thalassa
Wildbird
Wyrmlad
Eisul
Hornet
Korruptus
Lord Pumpseed
Madam Fusion
Nisael
Rubellus
Thundeer
Wickah
Crabbydroid
Hookuai
Lamia
LazarBeam
Nitroblaster
Rociuko
Synaptikus
Ugluk
Urtikus
Warmaster Elvira
These Legendary monsters are very good but cut just short of OP rank for having either lower stats or just weaker moves compared to OP rank. Despite that, many of these monsters are frequently used in the Legendary Meta.
Akunobuki
Draghar
Gorg
Helgudin
Neobuki
Nikasia
PZ Ronin
Warmaster Gortak
Zenfira
Clipeum
Devastress
Dunn Ra
Frazerot
Hyperia
Koralle Brutalis
Kronx
Llum the Magical Matriarch
Marquis De Flambe
Mephisto
Mirak
O'Reilly
Pierceid
Samael the Fever Scatterer
Samael the Plague Carrier
Warmaster Remntar
Warmaster Sherezar
Warthak the Mountainsplitter
Warthak the Sunbringer
Zunobia
Belbreath
Frosilka
Hobkin
Hydratila the Riftmaker
Ingenica
Kronxian Guard
Llum the Iron Leader
Makugan
Mop
Narok
Positron
Rekka
Ursus
Warmaster Babari
Warmaster Zahra
Xiron the Ruby
Zizania
Zombic
Restricted to monsters rivaling the ones in SS rank only to have lost due to either worse moves or worse stats.
Al Canine
Cain
Drakor
Faraday the Discharger
Faraday the Obscure
Gakora
Gualgui
Holter's Bodyguard
Hydratila the Boltcaster
Lighterium
Llum the Light of Freedom
Lucifire the Helltaser
Lucifire the Hopefreezer
Nabuline
Nadiel the Flooder
Nadiel the Pyromancer
Olnir
Qinling
Saika
Saulot
Silverleaf
Sunblast
Talos the Forgotten Artifact
Talos the Island Protector
Wangzhou
Warmaster Barbael
Wasper
Zeighar
Zorgon
Baba Yaga
Borjork
Burotgor
Demise
Dungeon Master
Faraday the Electrolyzer
Gelotron
Gurlik
iMigbo
Itzanami
Jasastur
Kihaku
Lady Solaris
Patient Cyber
Patrion
Prince Charmless
Samael the Disease Spreader
Shademoon
Shannara's Bodyguard
Stake
Talany
Talika
Volthar
Warmaster Necromancer
Warspellz
Yedra
Zameleon
Zyla the Faithful
Cloud
Copycat
Crissandre
Devastator
Eeltron
Flamerion
Francine Frank
Granuy
Grumpex
Hirondeleor
Hydratila the Icebringer
Inquisitor Fulmen
Lucifire the Lifemelter
Metalisha
Privateer Morgan
Rocigon
Scrap Warrior
Sergeant Hull Head
Soul Hugger
Sting Westclaw
Storm Beard
Tankerion
The Baroness
Thetys' Pet
Toshiro
Treetopog
Voytek
Warthak the Skullcrusher
Xiron the Emerald
Yimburbur
Restricted to monsters with mediocre performance in the competitive scene. These aren't the ideal monsters to go for, but are still somewhat usable if stronger monsters are not available.
Alpha Cliviast
Balor
Bo Tai
Brontes
Captain Copperbeard
Countess Flawless
Cryotan
Dr. Marihelson
Fatid
Fenrir
General Thetys
Gregorz of Lyria
Gretchen
Hackster
Igneus
Incognita
Ixofex
Kassia
Krugbo
Mishka
Montauk Creature
Muerte McBlood
Nadiel the Deforestator
Nishant's Bodyguard
Oikawa
Psilotus
Quixote
Rabbish
Rabooka
Rador
Shallinar
Skull Rivera
Talos the Automaton
Teskita
The Inheritor
The Undertaker
The Warrior
Tijen
Will "Razor Face"
Xiron the Quartz
Yamada
Zimnyaya
Alex Bone
Annihilator R2
Atum's Bodyguard
Bandses
Barbatos
Beledig
Bella Baal
Bright
Brynhilda
Carlo Canbino
Cavenfish
Enypiast
Famperium
Faugnar
Firael
Frostbite
Furrius Robin
General Atum
General Ingvar
Glitch
Greedy Dragon
Harusami
Igursus
Ihtiander
Jakugan
Kaih the Eradicator
Keithor
King Daeron
Kiridar
Kozorg
Krampus
Lau Lau
Learnean
Living Forest
Lord Mindson
M-2 WYVERN
Mercurius
Monky
Mountezuma
Petro Loa
Polaris Sea
Ragnael
Remiel
Sarah
Scaraborg
Shork
Sparking Mantis
The Keeper
Timerion
Totem
Tulekahju
Uther the Valiant
Wolfgang
Yilitre
Akhenotep
Alces' Bodyguard
Alces' Pet
Amphidator
Baron Traitor
Caillech
Chill Bill
Clivia
Eggeater
Exo Skeel
Fightreer
Frostwrath
Galante
General Darmith
General Uria
Himass
Hiroim the Tenacious
Hydrok the Forgotten
Laomu
Little Red Furry Cap
Lui Calibre
Lumoona
Malair
Master Skeel
Metalhëad
Mr. Scratch
Mystery
Nexor Cox
Nidaria
Nox the Condemned
Octex
Pa'Lhax
Pigredo
Pinky Flash
Queen Luthien
Ra'Zhul
Reptie
Roxen Cox
Scarr the Outcast
Scryb
Shannara's Pet
Singularis
Sphyrnus
Stinger S1
Taiga
Ukuduma
Uru
Valgar the Pure
Violet
Viperhotep
Vodyanoy
Yndra
Yntec
Ahran
Anton Acorne
Atum's Pet
Azuriel
Baltasar
Basthet
Blob
Cyan Nathura
Darmith's Bodyguard
Discobolus
Dr. Viktor
Dusk Aura
El Dino Volador
Erebus
Fampira
Galante Jr.
General Alces
General Holter
General Nishant
Goldfield
Goran
Griffin
Gullin
H2O Delirious
Hasai
Hercule
Jabaline
Layth
Legion
Lilysha
Mechamancer
Megaosteum
Minotaurus
Noctum
Obsidiane
Oghma
Ouros
Plymouth
Ralbog
Sir Automatronicus
Super Dan
Tempest
Thetys' Bodyguard
Uria's Bodyguard
Uria's Pet
Vanitus
VoltaiK
Monsters with below average performance in the Monster Legends meta, due to bad stats or bland moves. From this point on, monsters won't be viable at all in the Competitive Legendary meta.
Ape-X
Arcade
Commander Alvid
Count Vlad
Dracontium
Draza
Drekk
General Shannara
Globrush
Lord Mammoth
Lux Aura
Megapolaris
Mommy
Mr. Flaky
Nishant's Pet
Osteoclast
Raccorn
Super Tomato
Sylvannis
Tephra
Terroriser
The Judgement
The Prisoner
The Sentinel
Thyra
Uriel
Varuna
Vano$$
Virtue
Watinhart
Wildcat
Blockheart
C.Y.M.O.
Deadwolf
Firyna
Flirty
GaiaNova
Gangsterosaurus
Guava Juice
Holter's Pet
Ingvar's Bodyguard
Leviana
Lord of Atlantis
Lotan
Monster D.Vice
Olafur
Pixelion
Qin
Tesaday
Toy Master
Tyros
Vanoss
Atlas
Avaritia
D.A.D. Unit
Darmith's Pet
Darude
Ingvar's Pet
Killeraptor
Klectus
Lord Moltus
MMOnster
Osur the Brave
Panda Claus
R.O.F.L.
Shakti
Trilops
Tryon
Vadamagma
White Pandalf
These monsters perform extremely poorly in the meta due to multiple major problems with their movesets or stats. These are only viable for beginners and are usually very old monsters.
Arch Knight
Darkzgul
Dr. Hazard
Hoodini
Nemestrinus
Passion
Son-Cookie
Ultrabot
Firca
Kulkan
Lostyghost
ML-1 YAMATO
Monster Clutch
Rabies
Roastie
The Firestorm
White Walker
Chocolove
Firelequin
Sir Slumberly
The Ringer
These monsters are completely unusable. They are weaker than some of the best Epic monsters and aren't worth using in combat.
Predagelum
Shí Hóu
Cupid
Firus
Worker Hulk
These monsters are terrible, and outclassed by a good portion of epics. They should not be used in combat.
Rockantium
Hayman
Thundhare
Thorder
These monsters are outclassed by a good portion of Epics and even some Rares. These are the absolute worst Legendaries in combat, and generally shouldn't be used in any scenario.
What monster has the most HP in Monster Legends?
Top Legendary Health.
Hayman - 48,557..
Dunn Ra / Mephisto - 46,446..
Sergeant Hull Head - 46,434..
Clipeum - 45,541..
Fatid - 45,239..
Soul Hugger / Santerion - 44,636..
Koralle Brutalis / Rubellus - 44,335..
Eisul / Yedra - 43,430..
Who is the best general in Monster Legends?
General Atum is one of the best generals along with General Ingvar and General Thetys. He specializes in attacking while buffing himself and his team.
Who is the best tank in Monster Legends?
3.4
7. Cryotan..
3.5
6 [Tied]. Mephisto..
3.6
6 [Tied]. Eisul..
3.7
5. Dunn Ra..
3.8
4. Santerion..
3.9
3. Shelly..
3.10
2. Ouros..
3.11
1. Pangoliath..
What is the strongest rarity in Monster Legends?
Ancestors are a new rarity of monsters, the most powerful ones ever seen. Each Ancestor belongs to a faction, and they are unique monsters: Ancestors live in their own habitats, you can only possess one Ancestor of the same type [no duplicates], and they can't be ranked-up with any resources other than their own Cells.