NOTE: There's no Fly because instead I imagined there being a Flying Taxi service a few gens before Gen 8 (though I didn't call it a Taxi service, just a "Flying Service"). Still, you'd be given a Key Item called a "Fly Beacon" by the service and can use it anytime to summon a flying Pokemon to pick you up and take you where you wanted to go, so essentially a replacement for Fly.
- Cut: Laser Cutter (A limited-range laser beam made to effortlessly cut through thin trees and tall grass but not people, Pokemon, or non-plant material)
- Strength: Hover Handle (A handle that attaches to large and heavy objects and uses anti-gravity technology to make it easy to push)
- Flash: Lantern (A LED-covered lantern that brightly lights up the surrounding area)
- Rock Smash: Sonic Breaker (A hand held speaker that causes certain rocks to crumble apart with a high noise frequency most can't hear)
- Rock Climb: Extend Ladder (A collapsible ladder that fits into a cliff indentation and extends high to the top)
- Defog: Fog Fan (A high-powered fan with propeller blades made to create a clearing gust of air)
- Surf: Surf Scooter (A diver propulsion vehicle made for traversing through water)
* Whirlpool: GPS Navigator (A navigation system designed for the Surf Scooter to navigate it through rough waters. Needs to be used alongside the Surf Scooter)
* Dive: Scuba Set (A wet suit and breathing device that lets the wearer explore underwater with their Surf Scooter. Needs to be used alongside the Surf Scooter)
* Waterfall: Turbo Boost (A super charged set of propellers that attaches to the Surf Scooter allowing it to go up waterfalls. Also makes the Turbo Scooter go as fast as a Sharpedo on the overworld. Needs to be used alongside the Surf Scooter)
BTW if any of these items sound a bit out there, note that the character I imagined inventing and giving you these items being a mad scientist, lol. "Sure, I'll have a kid test out my exploration inventions. They're *mostly* safe. Just don't point them towards yourself".
This to me is the pinnacle of exploration items. This would allow you to complete a puzzle and still have the best 'Mons on your team. This would let you explore the world without making your Pokemon more tired (I mean, you can even ride around an Azumarill that's knocked out. I don't think I'm a very good Trainer). I think that having these would make the game more fun, though it probably won't happen. I also think it'd be cooler if it was the Professor who gave you these items, have a crazy Professor obsessed with exploring the region and finding these special Pokemon in those hidden areas, and randomly popping up when you run into an obstacle. I've always felt the Professor was pretty uninvolved in your journey anyway, kind of just standing by and then appearing at the end when you beat the League. Even Kukui wasn't very involved in the journey, kind of just "Oh ya beat it! Congrats! New TM/Ride Pokemon/gameplay tip!" The Professor being more involved in the journey would make it more realistic too, in my opinion. Birch is always complaining about "I'm itching to do some field work!" and every time you fly back there, he's just chilling. And so is EVERY OTHER PROFESSOR IN THE GAME.