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Booster Everything
This is the actual idea. Not sure if this is more of an OM or a pet mod, but I digress. Every item would function like booster energy, giving a boost based on its effect upon switch in before being consumed. This could range from obvious, like stat berries and choice items raising a stat by one stage, to creative, like terrain seeds setting a terrain and raising a stat, to brand new, like certain berries (occa category, forgot what they're called) removing the weakness entirely or giving a resist in the case of chilan berry, to everything in between.
HDB could ignore and remove hazards upon switchin
Air Balloon could grant the effects of Levitate
Throat Spray could grant the effects of throat spray and/or increase spA by 1 stage
Weather rocks could set the weather for the extended time
Light clay could either A: Set dual screens or B: set either light screen or reflect based on your mons lower defense stat
Mirror Herb could copy all of your opponent's stat changes upon switchin
Sitrus Berry could raise your max and current HP by 25%. Similarly, Aguav and such berries could raise current and max HP by 33% but always confuse the holder for balancing
Life Orb could give a 1.3x boost to both offensive stats or move base powers but take 10% of the Pokemons HP
Potential Banlist
Weakness Policy would double the offensive stats of any pokemon who holds it. This is very obviously broken.
Rocky Helmet, Jaboca Berry, and Rowap Berry. With these three, the obvious choice would be to have them take out the opponents health on switch in, but this wouldn't be very balanced. Rocky Helmet could grant the effects of rough skin, but then it just becomes a worse version of itself.
Unburden might be broken due to how items work here. At the very least an eye should be kept on it.
Mirror Herb might be an issue as a very powerful counter sweep option. Again, keep an eye on it.
Two crit stages is no laughing matter. Although not many pokemon could take advantage of it, Lansat berry could be considered uncompetitive under the right circumstances.
Overall, only weakness policy is very obviously broken. We'd probably have to finalize effects before making a full Banlist. Potential Questions
Q: How would items like Griseous Orb or Light Ball work with their pokemon?
A: The way I see it, items that induce a form change would do the exact same thing they normally do. For the most part, they aren't counted as items in a lot of effects anyways. Light Ball could give pikachu a +2 in both offensive stats unless someone has a better idea. Questions for Community
There are a lot of items that don't have obvious effects, like Metronome, status-healing berrys, expert belt, and the herbs to name a few. We'd have to figure out how these items would work if this were to become a meta.
Similarly, how would we balance effects to be balanced while staying relevant? Take miracle seed and co. They could give a 1.2x boost to their respective moves, but then it's just the same thing but it goes away upon switching. Would we buff the effect to give it some relevance? Would we just accept that some items would be naturally worse?
