The furthest back I can look is 100 edits ago. Here’s how it looked for PvP in August 2019…
S+: Angelion, Bloomeluga, Deathgazer, Delugazar, Dolphreeze, Dracorosa, Dusicyon, Geomagnus, Gyomurai, Jaguardian, Malwing, Oakthulhu, Stratustrike, Prismaryx, Tygoron
S: Baublebasher, Capybaragon, Celeshine, Cyclozar, Heavenswyrm, Kaerukenshi, Maggatsuoh, Magmarinus, Novadrake, Nulltron, Onigeist, Sobeking, Utopion, Valzareign, Zeuswyrm
A+: Albakhan, Ashterios, Bovolcus, Centaureon, Drakozord Z, Flocculasaurus, Gryphking, Infernicorn, Lunartic, Megaiasloth, Pumpking, Raizen, Sanctistag, Sweetfeather, Tagosenshi, Tardigrenade, Tezcacoatl, The Penguinator, The Rockoid, Tricranium, Voodoom, Wraithcaptain
A: Ankoudragon, Atlantyrant, Atrahasis, Aurodragon, Bundam, Bunkerbeast, Canishogun, Celestrion, Chromera, Cybereon, Dolpheonix, Emeraldeus, Flarevern, Goldtail, Grovodeus, Hellfox, Lavaronix, Leogeist, Mechaviathan, Nightlord, Noxdragon, Polaboss, Pupupa/Stormoth, Regalion, Shurikaizer, Tenebris, Terragar, Terrordragon, The Saintfeather, Triviathan, Zephyrin
B+: Aegisdragon, Astrogolem, Azrazel, Bahamuzar, Banedragon, Blitzdyr, Cosmodragon, Cryokaizer, Deodragon, Emeraldont, Gloreonix, Grizzleguard, Icefang, Jawshank, Jingledragon, Kamishogun, Kattmmander, Nebelronix, Omegasdragon, Oniblade, Pupupa/Doomoth, Pupupa/Dreamoth, Razoray, Sanctallion, Sarcrosphinx, Shivadragon, Staticsphere, Timberlord, Tinkerclaus, Tortogeist, Vulcaroth, Wraithhost
B: Apollorexus, Azuraidos, Crimseias, Galliodragon, Geartyrant, Metatherion, Mojinator, Motordragon, Nightrider, Prismpaw, Pupupa/Marksmoth, Revenarchion, Shadowyrm, Skeleviathan, Solblaze, Soulstealer, Taloknight, Zhulong
C+: Chronotitan, Chronozeros, Midasdragon, Serapheon, Shadowhunter, Stormloch, Tiamazus, Ultimadragon, Ziberius
C: Bazilogon, Burnsalot, Kamiwyrm, Polareon, Rexotyrant, Solariel, Tridrakhan, Warca
D: Doomengine, Dragaia, The Godfeather