How To Get Exp Share In Emerald

Alright, let's talk about the Exp Share in Pokémon Emerald. Think of it like this: you're at a potluck, right? You brought the killer potato salad (your strong, well-leveled Pokémon), and your friend brought… well, let's just say it's questionable veggie platter (that low-level 'mon you're trying to train). The Exp Share is basically letting your friend secretly sneak a few spoonfuls of your amazing potato salad without doing any of the actual work. Everyone wins (except maybe the veggies).
So, how do you get your hands on this precious, experience-giving item? It's actually pretty straightforward, even if it involves a slightly awkward encounter with a company president who seems to spend more time underwater than in his office.
The Devon Corporation Caper
The key to unlocking the Exp Share lies within the hallowed (and slightly musty) halls of the Devon Corporation in Rustboro City. Yes, the same Devon Corporation that seems to be single-handedly responsible for like, 80% of the technology in Hoenn.
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First things first, you gotta beat Roxanne, the Rock-type Gym Leader. Think of her as the bouncer at the Exp Share party. You can't get in until you show her you've got what it takes. Once you’ve got that Stone Badge glistening on your trainer card, it’s time to hit up Devon Corp.
Inside, you'll find the president, Mr. Stone. He's usually chilling in his office on the top floor. Now, Mr. Stone isn't just any company president. He's got a serious problem with Team Aqua, those ocean-obsessed goons who apparently think that covering the world in water is a good idea (spoiler alert: it's not).

He'll task you with a mission. A mission so important, so crucial to the safety of the Pokémon world, that… actually, it mostly involves retrieving a stolen package and delivering a letter. It's basically the Pokémon equivalent of running errands for your grandma, but hey, we’re getting Exp Share out of this!
Package Delivery & Pesky Pokémon
Your first task is to retrieve the Devon Goods from a Team Aqua grunt who’s decided to make trouble in the nearby Rusturf Tunnel. It’s a fairly simple fight. Just flex those Pokémon muscles (that Roxanne helped you develop!), and you’ll send that grunt packing faster than he can say "global warming!"
Next, you're off to Slateport City to deliver a letter to Captain Stern at the shipyard. This is where it gets interesting. You'll have to battle a Team Aqua grunt again on Route 110. Those guys are like persistent door-to-door salespeople, aren't they? They just never give up.

The Sweet Reward
Once you've delivered the letter to Captain Stern and watched him get accosted by even more Team Aqua goons (Seriously, what is it with these guys?), head back to Mr. Stone at Devon Corporation in Rustboro City.
He'll be so grateful for your heroic efforts (and your willingness to do the errands he clearly can't be bothered with himself) that he'll reward you with the Exp Share! Hallelujah!

Now, you can finally train that Magikarp you've been lugging around without wanting to throw your Game Boy across the room in frustration. The Exp Share distributes experience points to a Pokémon even if it doesn't participate in battle. Just give it to the Pokemon you want to level up without having to put them in front of dangerous opponents.
It's like giving them a participation trophy, but instead of a cheap plastic trinket, it's sweet, sweet experience points. Enjoy!
And remember, the Exp Share is your friend. Use it wisely (and maybe share your potato salad with a few other struggling Pokémon along the way).
