- Pokemon LeafGreen post game begins right after you defeat the Champion and enter the Hall of Fame.
- National Pokedex: Catch at least 60 Kanto Pokemon, then speak with Professor Oak in Pallet Town.
- Ruby and Sapphire quest: Restore Celio's Network Machine to unlock Four through Seven Island.
- Mewtwo: Cerulean Cave only opens after the Network Machine storyline is finished.
- Roaming legendary: Raikou, Entei, or Suicune appears in Kanto based on your starter choice.
Pokemon LeafGreen Post Game Unlocks
The Pokemon LeafGreen post game starts the moment your rival's final Pokemon falls at Indigo Plateau. Instead of ending the adventure, the credits open a second campaign across Kanto and the Sevii Islands: the National Pokedex, Celio's Network Machine quest, the outer islands, and the strongest legendary encounter in the game. Work through the unlocks in the order below so no area stays locked longer than it should.
| Unlock | Requirement | What It Opens |
|---|---|---|
| National Pokedex | Catch 60+ Kanto Pokemon, then visit Professor Oak | Johto species tracking and expanded dex goals |
| Rainbow Pass | Deliver the Ruby to Celio on One Island | Travel to Four, Five, Six, and Seven Island |
| Rocket Warehouse | Collect both Team Rocket passwords | Final Team Rocket battle and the Sapphire |
| Cerulean Cave | Finish the Ruby and Sapphire quest | Mewtwo encounter at Lv. 70 |
| Roaming legendary | Enter the Hall of Fame | One beast roams Kanto based on your starter |
Professor Oak checks Pokemon you have caught, not merely battled. Every evolution you register also counts as a new entry, so evolving duplicates is a fast way to push past the 60-Pokemon threshold before sailing back to the Sevii Islands.
Ruby and Sapphire: Network Machine Quest
The Ruby and Sapphire quest is the backbone of the entire post game. It gates the Rainbow Pass, the second Sevii Islands arc, expanded trading, and eventually Cerulean Cave. Follow this sequence and the Network Machine will be running in a single focused session.
Unlock the National Pokedex
Catch at least 60 Kanto Pokemon and return to Professor Oak in Pallet Town. He upgrades your Pokedex, which is the trigger for every later post-game event on the islands.
Take the Ruby from Mt. Ember
Sail to One Island with the Tri-Pass and head up Kindle Road to Mt. Ember. Battle the Team Rocket grunts digging near the entrance, enter the new cave, and recover the Ruby. Deliver it to Celio at the Pokemon Network Center to receive the Rainbow Pass.
Clear Icefall Cave on Four Island
Explore Icefall Cave, pick up HM07 Waterfall, and help Lorelei corner the Team Rocket grunts inside. Stopping them here weakens the group you will face at the warehouse later.
Recover the Sapphire at Dotted Hole
Travel to Six Island and push through Ruin Valley to Dotted Hole. Use Cut on the entrance door, descend to the inner chamber, and grab the Sapphire. A scientist immediately steals it, but he drops the second Rocket Warehouse password as he flees.
Raid the Rocket Warehouse on Five Island
Enter the warehouse with both passwords, solve the warp tile puzzle, and defeat the remaining Team Rocket trainers. Recover the stolen Sapphire from the scientist after the final battle.
Restore the Network Machine
Return the Sapphire to Celio on One Island. With both gemstones installed, the Network Machine becomes fully operational and Cerulean Cave opens back in Kanto.
Losing the Sapphire at Dotted Hole is part of the story, not a mistake. Do not reset your save. Chase the scientist to the Rocket Warehouse on Five Island and finish the questline there to reclaim it.
Legendary Hunting After the Credits
Once the Network Machine hums again, the biggest prizes of the post game become available. Mewtwo waits in a fixed cave, while one Johto beast roams the routes of Kanto and only you can decide which one appears.
Mewtwo
- Lv. 70 static encounter
- Cerulean Cave, deepest chamber
- Hardest catch in the game
- Master Ball is the simple answer
Roaming Beast
- Lv. 50 roaming encounter
- Moves between Kanto routes
- Flees on the first turn
- Track it through the Pokedex area function
Johto Catches
- New species on outer islands
- Sevault Canyon encounters
- Feeds National Pokedex progress
- Some are version exclusive
| Legendary | Location | Level | Key Requirement |
|---|---|---|---|
| Mewtwo | Cerulean Cave | 70 | Network Machine quest finished |
| Entei | Roaming Kanto | 50 | Chose Bulbasaur as starter |
| Suicune | Roaming Kanto | 50 | Chose Charmander as starter |
| Raikou | Roaming Kanto | 50 | Chose Squirtle as starter |
You hold only one Master Ball per save file. Mewtwo sits in a fixed cave and can be worn down at leisure, while the roaming beast escapes every encounter. Many players throw the Master Ball at the roamer and catch Mewtwo manually with Ultra Balls and sleep support.
Post-Game Checklist and Optional Areas
Beyond the main quest chain, the outer islands hide optional battles, puzzles, and encounter tables worth clearing before you call the save file finished. Use this checklist to track the full post-game sweep.
Post-Game Milestones:
- Catch 60 Kanto Pokemon and unlock the National Pokedex
- Recover the Ruby from Mt. Ember and receive the Rainbow Pass
- Obtain HM07 Waterfall in Icefall Cave
- Retrieve the Sapphire and clear the Rocket Warehouse
- Restore Celio's Network Machine on One Island
- Catch Mewtwo inside Cerulean Cave
- Track down your starter-dependent roaming legendary
- Clear Trainer Tower on Seven Island
| Optional Area | Island | What It Offers |
|---|---|---|
| Trainer Tower | Seven Island | Timed multi-mode battle challenges |
| Sevault Canyon | Seven Island | Wild Johto Pokemon and rare encounters |
| Tanoby Key and Ruins | Seven Island | Puzzle that unlocks Unown chambers |
| Icefall Cave | Four Island | HM07 Waterfall and the Lorelei event |
| Berry Forest | Three Island | Berry pickups and wild encounters |
Restoring the Network Machine expands what your save file can trade with. On the current Nintendo Switch release, trading runs on local wireless between nearby systems instead of the original Game Boy Advance link cable setup, so plan trades with a friend who also owns the game.
Post-Game FAQ
Almost every post-game blocker traces back to two things: the 60-Pokemon National Pokedex requirement and the unfinished Ruby and Sapphire quest. Check those first whenever a door stays shut.
Q: What should I do first in the Pokemon LeafGreen post game?
Catch Kanto Pokemon until you own at least 60 species, then visit Professor Oak in Pallet Town for the National Pokedex. That upgrade triggers Celio's quest on One Island, which unlocks every other major post-game area including Four through Seven Island and Cerulean Cave.
Q: How do I unlock Mewtwo in Cerulean Cave?
Become Champion, obtain the National Pokedex, and finish the entire Ruby and Sapphire questline for Celio. Once both gemstones power the Network Machine, the guard leaves Cerulean Cave and you can battle the Lv. 70 Mewtwo inside.
Q: Which roaming legendary appears in my game?
It depends on your starter. Bulbasaur brings Entei, Charmander brings Suicune, and Squirtle brings Raikou. Only one of the three appears per save file, and it flees battles, so bring a trapping move like Mean Look or use your Master Ball.
Q: Is there anything to do after the Network Machine is fixed?
Yes. Catch Mewtwo, hunt your roaming legendary, clear Trainer Tower, solve the Tanoby Key puzzle to open the Unown ruins, and keep filling the National Pokedex with Johto species found across the outer Sevii Islands.