If you're playing with the Myths and Legends[Cobblemon Sidemod] and your following problems are: "Cant get them to spawn", "Cant find specific item", "Does this work with modded structures?", and "Archaeology is useless", then check out this modpack!
I sandwiched together some things in the Loot Tables File and managed to get them working in a modpack. If you're using or want to use mods like Repurposed Structures,Yung's Better Dungeons, and Terralith, then this modpack is for YOU! Keep in mind that this was done using the fabric version of Myths and Legends.
HOW TO MAKE ITEMS INSTANT SPAWN LEGENDARIES
Download the Myths and Legends Datapack and put it in your "resource pack" folder.
https://modrinth.com/datapack/myths-and-legends-datapack
Use this datapack if you are using 1.20.1 forge (the full experience):
https://modrinth.com/datapack/myths-and-legends-datapack/version/1.0.4
Note that the "Global Packs" mod, which is in this modpack, is what makes it this easy to install the datapack.
IMPORTANT NOTE ABOUT MODELS
Not every legendary and mythical has a model. That is the responsibility of either 1. The person who made the "missing legends" resource pack (which is in the modpack) adding in the rest of the missing models, or 2. The people behind the Cobblemon mod adding in the all of the models for the legendaries and mythicals. The creator of the Myths and Legends[Cobblemon Sidemod] has absolutley nothing to do with your missing models, nor can he do anything about it.
Main Mods Links
Cobblemon:
https://www.curseforge.com/minecraft/mc-mods/cobblemon
Myths And Legends:
https://www.curseforge.com/minecraft/mc-mods/myths-and-legends-cobblemon-addon
KEY ITEM LOCATIONS:
Most key item generation rates have been buffed for some of these structures. So if you had issues looking for a particular key item, there will be a structure that you can narrow your focus on to find said item. Here's a list of each key item and the BEST place to find them:
Adamant Orb - End Pyramid
Aurora Ticket - End Pyramid
Azure Flute - End City Treasure
Blue Orb - Ocean Ancient City(archaeology)
Bonus Disk - End City Treasure
Clear Bell - Ancient City, Sniffer Digging
DNA Splicers - Snowy Mansion
Eon Ticket - Temperate Gimmighoul Tower(archaeology)
Griseous Orb - Ancient City
GS Ball - Sniffer Digging, Rooted Arch Ruins
Jade Orb - Terralith Spire
Liberty Pass - Trail Ruins, Nether Monument
Lustrous Orb - End Pyramids, End City Treasure
Member Card - Ancient City
Oak's Letter - Flower Forest Pyramid
Old Sea Map - Ancient City Ocean
Red Orb - Crimson Temple
Rusted Shield - Ancient City
Rusted Sword - Ancient City
Tidal Bell - Ocean Ancient City(archaeology)
Dr.Fuji's Diary - Woodland Mansion
Rainbow Wing - Sniffer Digging
Silver Wing - Ocean Mineshaft
Violet Book - Warped Mineshaft
Scarlet Book - Sniffer Digging
Cocoon Of Destruction - Nether Fortress
Sapling Of Life - Flower Forest
Zygarde Cell/Core/Cube - Mineshaft Swamp
Mystery Box - Terralith Underground Structures, Desert Mineshaft
Reveal Glass - Desert and Savanna Mansions
Dark Stone - Trail Ruins
Light Stone - Trail Ruins
Teal Mask - Taiga Mansions, Giant Taiga House
Sun Flute - Bastion Remnant
Moon Flute - Warped Mineshafts
Lunar Feather - Cobblemon Bases, Trail Ruins
Magama Stone - Bastion Remnant
Diance's Crown - Mineshaft, Terralith(Underground Structures)
Fini Totem - Buried Treasure
Genesect Drive - Woodland Mansion
Grassland Blade - Jungle Mansion, Pyramid(Flower Forest/Jungle)
Hoopa Ring - Warped Temple
Ironwill Sword - BetterStrongHolds Treasure
Koko Totem - Desert Monument
Lele Totem - Flower Forest Pyramid
Lillie's Bag - Villages
Meloetta Headset - Flower Forest Pyramid
Necro Prism - BetterStronghold, End(Pyramid/Stronghold)
Prism Bottle - BetterStronghold
Sacred Sword - Jungle Temple, Toppled Pillar Ruins
Steam Valve - Bastion, BetterNetherFortress
Type:Null Mask - BetterDungeon(ZombieDungeon)
Antique Pokeball - Desert Mansion, Terralith(UndergroundStructures)
Eternatus Core - End Stronghold
Kubfus Band - BetterDungeon(ZombieDungeon)
Marshadow Hood - Woodland Mansion, BetterDungeon(Zombie/Skeleton)
Plasma Tablet - Ancient City
Prismatic Shell - Terralith(UndergroundStructure)
Reins Of Unity - Taiga Mansion and Mineshaft
Scaly Tablet - Crumbling Arch Ruins, Ancient City
Scroll Of Water - Buried Treasure
Soul Heart - Soulsand Temple, Ancient City
Zarude's Cape - Dark Forest(Pyramid/Mineshaft)
Zeraora's ThunderClaw - Desert Monument
Ancient Tablet - Unstable Cave Ruins, Ancient City
Mythical Pecha Berry - Flower Forest Pyramid
Scroll Of Darkness - Dark Forest Pyramid
Azelf Fang - Fishing Shipwreck Treasure
Mesprit Plume - Fishing Shipwreck Treasure
Stone Tablet - Desert Monument, Badlands Pyramid
Uxie Claw - Fishing Shipwreck Treasure
Ice Tablet - Icy(Monument/Pyramid)
Steel Tablet - Unstable Cave Ruins, Ancient City
Bulu Totem - Desert Monument
Cavern Shield - Mesa Mineshaft
Iceroot Carrot - Snowy Mansion
Shaderroot Carrot - Woodland Mansion, BetterDungeon(Zombie/Skeleton)
Here are the biomes in which you use the key items in, as well as their requirements for specific legendaries https://wiki.0skill.de/
If you have any questions or concerns, hangout in the discord server made by the Myths & Legends mod creator:
https://discord.gg/NaG5xQr73P

