Singleplayer:

Put the .zip in /saves/[WORLDNAME]/datapacks
Put the .zip in /resourcepacks
Enable in game ESC - Options - Resource Packs

Servers:

Put the .zip in /world/datapacks
Sometimes it's called myworld, or something similar, sometimes it has a name instead
If you're in doubt about the correct folder, consult your server providers guide on how to add datapacks

Every Player has to have the .zip installed as a Resource Pack
Best option if for them to have it installed and enabled in their clients
It's possible to add them to server resources, but note that there have been issues with this for some cobblemon addons, so try whatever method suits you better

Use Dream Catcher on a Mismagius and afterwards on a Rayquaza (requires Mega Showdown)

• Illusion Rayquaza is a Ghost/Flying type with moves from both mons
• Its Mega is Dragon/Flying type but keeps the same move pool

Rare spawn in Woodland Mansions
Use shears on any male Eevee or evolution to turn it into Sandy (requires Mega Showdown)

• All Eeveelutions of Sandy have their own unique Hairstyles
• Evolves normally into all eevee evolutions
• Can Gmax and use Gmax-Cuddle normally (requires Mega Showdown)

Ultra-Rare spawn in the Deep Dark

• Mimikins is always female and its shiny is inverted
• Can use its Z-Crystal & Ability normally (requires Mega Showdown)

Put a Nether Star and a Charcoal Stick/Miracle Seed/Mystic Water into a Resurrection Machine

• They come with 4 perfect IVs (HP, Defense, Special Defense & Speed)
• They require less EXP to level up, compared to their counterparts (fast experience group)
• They mega evolve normally (requires Mega Showdown)

Rare spawn in caves/underground

• Evolves into Crystal Steelix normally (trade + metal coat)
• Entire line has the ability Water Absorb
• Mega evolves normally (requires Mega Showdown)

Ultra rare spawn at level 100 in naturally generated villages (Vanilla & BCA)

• Cannot Mega evolve, breed, or be evolved into
• Has custom stats and Movepool to closer reflect his appearance in the manga
• Has his own Z-Move/Crystal (requires Mega Showdown)
  • Black Tyranitarium Z transforms the move Rock Wrecker into Kaiju Cataclysm
  • Kaiju Cataclysm hits all Pokémon on the field, removes terrain, raises both of his defenses by one stage & makes all targets flinch
  • Black Tyranitarium Z won't show in JEI/REI/EMI nor the Creative Tab, to obtain it you have to follow this crafting recipe: (Rockium-Z & 4x Dark Gem)

This pack contains a few Pokémon that are not animated well or at all in the base Cobblemon mod so here are some fully compatible addons that add better animations to them! Make sure to put their resource packs obove Lost Lore so they can override the animations!

CobbleMotion:

Adds animations to Mimikins/Mimikyu alongside many others!

OJ's Animations:

Adds animations to the golden Sudowoodo alongside many others!

Eeveelutions Reimagined:

Adds animations to Sandy (Lana's Eevee) & their Eeveelutions, alongside the regular ones!