v21.1 Mix-And-Mega 1.4

What would happen if you let any Pokémon use any Mega Stone, and gain the stat-boosts thereof?
Smogon asked that question and made a metagame around it! This concept has since expanded to include all form-changing items such as the Primal Orbs, the Timespace Crystals, and the Rusted Armors (but not Ultranecrozium Z because it has two different base forms with different stats)
It's an interesting concept, so I made a plugin that allows you to apply this logic to your own game, without making a separate form for every individual combination of species and stone. It even works for non-Rayquaza mons that know Dragon Ascent (something Smogon doesn't allow, for balance reasons)!

It's fairly simple: just download the zip file, and plop its contents into your game's root folder.

Settings include:

• Which items should be considered "Mega Stones" even if not normally considered such (Smogon treats the Red/Blue Orbs, Rusted Sword/Shield, Adamant Crystal, Lustrous Globe, Griseous Core, and Ogerpon's Masks this way), as well as which Pokémon they should grab their data from.
• Whether the height and weight changes should be treated as multipliers (as I think makes sense) or as additives (as Smogon does)
• Whether a Smergle that qualifies for multiple Megas should get all the stat boosts, or just the item's.
• Whether the Rusted Sword/Shield should change the move Iron Head (to Behemoth Blade/Bash) on any Pokémon that holds the items.
• Whether Ogerpon's Masks should boost non-Ogerpon Pokémon's damaging moves (by 1.2)
• Whether Ogerpon's Masks should change non-Ogerpon Pokémon's abilities.
• The maximum number of Megas each user can have per battle, and whether the AI is immune to such limits.
• As well as arrays that can be used as banlists.

In addition, changes have been made to the Bag screen so that qualifying items will show the boosts they give, as opposed to their descriptions. This change is compatible with Bag Screen with Interactive Party and B2W2 Bag Screen already.