Beedrill’s Mega Stone, Beedrillite, can be found behind a locked storage room inside Sea Mauville. To obtain the Storage Key needed to enter the storage room, you need to fully explore Sea Mauville by using both HM03 Surf and HM07 Dive.
Mega Stones are held items that allow certain Pokémon to Mega Evolve, granting them a massive boost to their base stats. Most Mega Evolutions also change the Pokémon’s ability, which lasts until the battle concludes.
Beedrillite allows Beedrill to Mega Evolve into Mega Beedrill. Packing an extremely high Attack and Speed, Mega Beedrill is a threatening glass cannon. Its new ability, Adaptability, makes Bug and Poison-type moves extremely lethal.
However, its defenses are abysmally low. Which means you have to outspeed all your threats before they get to attack you. Luckily, it can outspeed most Pokémon.
Beedrillite Location (Step-by-Step)
Sea Mauville is a half-sunken decommissioned research facility located north of Route 108. While you can explore Sea Mauville when you first have Surf, you won’t be able to fully explore it without Dive.
To reach the Beedrillite’s location, you’ll need:
- The seventh Gym Badge from Mossdeep City to use Dive outside of combat
- A Pokémon that knows HM03 Surf
- A Pokémon that knows HM07 Dive
In Sea Mauville, you will have to retrieve various keys to unlock different parts of the ship. Eventually you’ll find the Storage Key, which unlocks the room where the Beedrillite is located.
Once you’re ready, head over and Surf to Sea Mauville’s entrance.
Step 1: Surf over to the side of the ship.
Step 2: Head up to the ship’s deck.
Step 3: Turn right and enter the ship’s interior.
Step 4: Go left, and then head straight down.
Step 5: Use Surf on the water, and then Dive at this spot.
Step 6: Once you’re underwater, follow the path heading south.
Step 7: Turn right and follow the path going east.
Step 8: Now that you’re on the right side of the ship, follow the path heading north.
Step 9: At the end of the path, return to the surface.
Step 10: Head north and talk to the child wearing the pink inner tube to obtain the Key to Room 1.
Step 11: Using Dive, make your way back to the left side of the ship to open the locked room on the right (pictured below).
Step 12: Inside Room 1, interact with the locker to obtain the Key to Room 2.
Step 13: Use the second key to open Room 2, which is located directly below Room 1.
Step 14: Inside Room 2, talk to the girl on the right to obtain the Key to Room 6.
Step 15: Head back to the right side of the ship to open Room 6, which is located near the child who gave you the first key.
Step 16: Exit the ship by using the door inside Room 6.
Step 17: Outside, ask the fisherman if he caught anything to obtain the Key to Room 4.
Step 18: Return to the ship and open Room 4, which is located right across the hall from Room 6.
Step 19: The Storage Key can be found on the ground, right near the bed.
Step 20: Head back outside and use the storage key on the door located at the side of the ship, northwest of where the fisherman is (pictured below).
Step 21: After a brief cutscene, you can finally obtain the Beedrillite (pictured below).
In this same room you can also get a few more interesting items:
- TM13 Ice Beam
- 8 Big Nuggets
- 4 Nuggets
- And a Luxury Ball
- Where To Get Beedrillite in Pokémon ORAS