I will give yet another shot for this one. Sorry if I become bothersome...
Metagame name: Instant Happening
Metagame premise: Everything that could wait for a turn or more, will inevitably happens (at now or at the end of turn, depended on the move). Anything that goes for five or more turns will inevitably ends at the end of the turn it was used. Anything that stays as long as the Pokémon is around does not count toward this metagame's rule.
Solar Beam/Blade will strike the moment it got activated (without Sun), Perish Song will instantly take effect and faint all Pokémon at the end of the turn of its usage, and the Weathers, Terrains and Rooms will go away after a turn. Future Sight and Doom Desire will also strikes at the end of the turn. There is no such thing as "take effect at the next/umpteenth turn".
Potential bans and threats: OU Clause. Perish Song could be considered as too unhealthy despite the sacrifice, and if Hyper Beam counted seeing the "recharge at the next turn", Porygon-Z could subject into suspect test or even outright ban as the recharge would happens at the same turn anyway after the usage of move (this at least, if Mega Kangaskhan was unbanned, would stop the Giga Impact spamming). With Psychic Terrain being almost useless (except for one turn Priority protection for Tapu Lele), priority become more prominent, and multiple moves such as Future Sight, Solar Beam/Blade, Sky Attack and other similar attacks are becoming more useful. Psychic-type, Grass-type and Flying-type may become more powerful with the unrestricted aforementioned move.
EDIT: Kyurem-Black may also get suspect tested does to finally having access to a powerful and useful Ice STAB in the form of Freeze Shock. Rest would also be too unhealthy does to potentially making stall too unpractical to deal with.
Questions for the community:
+ Which Pokémon could benefit the most from metagame's rule, and which Pokémon would be most hindered by the same rule?
+ Do the Hyper Beam variation counted toward this rule, or would be those too powerful in these case?
+ Which strategy (Offensive, Sweeping, Defensive, Stall, etc.) would be mostly affected by this rule?
EDIT: Wow! Five likes already? The intensity with the lack of charge and recharge, as well as every multi-turn mechanics such as Weathers into one-turn as something to do with it, this can be more favoured for both bulky and fast sweepers! Thank you all!