Mix and Mega Doubles
(I'm entirely aware that mashup om can't be accepted and it's available in ROM (which still follows Mix and Mega clause), so take this as an echo ban list change proposal if you will.)
Metagame premise: Almost every Pokemon can mega evolve with almost every mega stones (or orbs) with the usual limit of one Mega Evolution removed, now in Doubles (Ubers) format!
Clauses: Doubles Ubers clause (Meaning Dark Void is banned while Mega Rayquaza and Baton Pass are allowed), Mega Stone / Orb Clause (only one of each stone on a team)
Banned Stones: Beedrillite, Blazikenite, Gengarite, Kangaskhanite, Mawilite, Medichamite, Pidgeotite
Pokemon that can't Mega Evolve: Arceus, Deoxys-A, Deoxys-N, Dialga, Giratina, Groudon*, Ho-Oh, Kyogre*, Kyurem-Black, Kyurem-White, Lugia, Lunala, Marshadow, Mewtwo*, Necrozma-Dawn-Wings*, Necrozma-Dusk-Mane*, Palkia, Rayquaza*, Regigigas, Reshiram, Slaking, Solgaleo, Xerneas, Yveltal, Zekrom, Zygarde with Power Construct.
* indicates that this Pokémon is still permitted to hold native Mega Stones.
Potential Bans and threats:
Magearna is easily one of the best Pokemon in Doubles Ubers thanks to Soul-Heart, which boosts its Sp. Attack every time a Pokemon faints. With more Pokemon in the field, it’s much easier for Soul-Heart to activate. Also, Trick Room can solve its speed issue while supporting other slower Pokemon. An experienced player definitely will not let Magearna Mega Evolve first in Mix and Mega Doubles so it can rack up the boosts from Soul-Heart, and then mega evolve for more firepower after obtaining enough boosts.
While I would disallow Magearna from mega evolving, I decided it would better to see it in action first before taking any action.
Red Orb and
Blue Orb are even better in MNM Doubles as they now can support partner with the primal weather. Again, it’s better off seeing them in action first before doing something.
Jirachi serves as a redirector in Doubles, it can safety scout setup sweepers such as Zygarde and Xerneas with Follow Me. With the help of the mega stones, it gives Jirachi more bulk and even changes its type… at the cost of Serene Grace and berry recovery. Still, it’s definitely something that should be approached with caution.
Unbans in MNM Doubles:
Electrify only affects one Pokemon at a time and there’s only one mega stone with an Electric-type immunity ability, making the move far more tolerable there.
Shadow Tag is unbanned as the main users, Mega Gengar and Gothitelle are far more manageable in Doubles Ubers. Which also means Gengar can mega evolve with Gengarite there.
One of
Deoxys Speed’s main appeal is setting up entry hazards. However, the demand of entry hazards isn’t exactly high in Doubles, so it’s permitted to mega evolve in Mix and Mega Doubles. Helps that the main culprit that's unrelated to entry hazards, Pidgeotite is still banned.
One thing that makes
Dragonite busted in Mix and Mega is Multiscale. Since it can be double targeted, therefore making it much easier to deal with in MNM Doubles, Dragonite is permitted from mega evolving… and it’s better off mega evolve as soon as possible.
Pheromosa isn’t particularly threatening in Doubles, so it’s allowed to mega evolve. Even with some astonishing benefits, doubt that it will be banned from mega evolving in the future.
And in case you miss it,
Mega Rayquaza is allowed in Mix and Mega Doubles due to following the Doubles Ubers clause.
Questions about the community:
What else would you like to add? Should restricted mega stones like Blazikenite be unbanned? Do you think it's a good idea to permit Slaking and Regigigas from mega evolving there?