Pokémon

  • Bulbasaur: Defeat every trainer in Viridian Forest and talk to a guy in Viridian Forest.
  • Charmander: Defeat every trainer in Route 24 and talk to a NPC in Route 24.
  • Squirtle: NPC in Vermilion City, requires beating Lt. Surge.
  • Second fossil: Talk to the same guy that gave you the first one once you beat the League.
  • Moltres: Victory Road 2F
  • Mew: Use Surf in the Vermillion Harbor. Use strength in the truck. You need to beat the Champion once to do this.
  • Mewtwo: Same location as Fire Red/Leaf Green. You don’t need Rock Smash for it, there is a path without it.

Check any Pokémon location

  • Make sure Pokédex Mode is set to Easy in the Options menu
  • Look for the Pokémon that you want to find in the Pokédex
  • Press A in it’s entry until you reach the Area screen
Screenshot 1Screenshot 2Screenshot 3

Items

  • DexNav: Shows wild pokémon in your current location. Trainer School in Viridian City
  • Appeal Sensor: Lets you see your Pokémon conditions (cool, beauty…). Given by a girl in the Contest Building in Vermilion City
  • Watering Can: Allows you to water berries. NPC in Route 7.
  • Light Ball: To improve your Pikachu stats. Buy in Celadont Department Store, 4 Floor.
  • Upgrade, Metal Coat, King’s Rock: To evolve certain Pokémon. Buy in Celadont Department Store, 4 Floor.
  • Technical Machines: Allows you to buy every TM. They get unlocked as you get more badges. Top of Celadon Dept Store, there are machines to buy them.
  • Linking Cord: Evolves Pokémon without trading. Key Item. Defeat your rival in Silph Co.
  • Shiny Charm: Can’t be obtained yet.
  • Rock Smash: Can’t be obtained yet. You can get to Mewtwo without it.

Misc things

  • Stats Judge: Allows you to see IVs in the summary screen. NPC inside the Pokémon Lab of Cinnabar Island
  • NPC to check Hidden Power type: NPC inside a house in Lavender Town.
  • Move reminder: NPC in Cerulean City, costs 5k
  • Power Items: Allows you to win 2 times the EVs of the selected stat. NPC before entering the Elite 4. You must be champion first.
  • Move Tutors: NPCs of Move Tutors removed. You can obtain those moves with the Move reminder.

Trainer Card Stars

  • Complete the Pokémon League
  • Catch every Kanto Pokémon
  • Obtain every in-game achievement
  • Obtain every Gen 3 Pokémon (requires trading)

Achievements

  • Since version 1.8.0, the game has as in-game menu called Chievos. Those are purely made to track progress and small achievements, they don’t give any type of notification or reward when completed.