Part 1: World 1 — Peach's Castle: Power Star 1 (Princess Peach)

World 1-1 and 1-2, Toad Town and its sewers, the Battle School and Peach's Castle, where Toadsworth, Bowser and then Peach are fought. The Exp. Share comes after this Power Star.

World 1 — Peach's Castle: Power Star 1 (Princess Peach) opens 10 areas. There are 19 trainers standing in them. The fights at this checkpoint are Luigi (Piranha Plant), Luigi (Blooper), Luigi (Bob-omb), and 2 more.

Where to go

1. World 1-1

   Wild: Goomba 34% · Lv —, Koopa Troopa 34% · Lv —, Ant Trooper 16% · Lv —, Twirlip 15% · Lv — +3 more

   Trainers: ★ Luigi (Piranha Plant) Lv 5, ★ Luigi (Blooper) Lv 5, ★ Luigi (Bob-omb) Lv 5

   Pick up: Stardust (hidden — near the guard toad)

2. Mario's Pad

   Wild: Blooper Lv —, Bob-Omb Lv —, Piranha Plant Lv —

3. World 1-2

   Wild: Goomba 40% · Lv —, Ant Trooper 35% · Lv —, Koopa Troopa 25% · Lv —

   Trainers: Youngster Satoru Lv 2, Youngster Ken Lv 3, Royal Guard Satoshi Lv 3, Youngster Shigeru Lv 6

   Pick up: TM76 Low Sweep, Syrup (hidden — a yellow block)

4. World 1-2 Underground

   Wild: Cheep Chomp 95% · Lv —, Buzzy Beetle 40% · Lv —, Brolder 35% · Lv —, Koopa Troopa 25% · Lv —

   Pick up: TM76 Low Sweep

5. Peach's Castle Gardens

   Wild: Boo 40% · Lv —, Nipper 40% · Lv —, Beanie 30% · Lv —, Shy Guy 12% · Lv — +1 more

   Pick up: Big Root (hidden — on a yellow block)

6. Toad Town Sewers (Connection)

   Wild: Fighter Fly 30% · Lv —, Koopa Troopa 30% · Lv —, Buzzy Beetle 20% · Lv —, Lava Drop 19% · Lv — +1 more

7. Peach's Castle

   Wild: Buzzy Beetle 40% · Lv —, Thwimp 25% · Lv —, Beanie 20% · Lv —, Dino Torch 15% · Lv — +3 more

   Trainers: Royal Guard Koji Lv 6, Royal Guard Shigeki Lv 6, Toadsworth Lv 9, ★ Koopa King Bowser Lv 11, ★ Princess Peach Lv 11

   Pick up: TM37 Surf, TM38 Charm, TM51 Bullet Seed

8. Toad Town Sewers

   Wild: Bald Cleft 45% · Lv —, Eerie 30% · Lv —, Gloomtail Lv —

   Pick up: TM39 Will-O-Wisp, TM54 Earthquake, Bros. Bean (hidden — rock), Max Mushroom (hidden — rock), Nugget (hidden — rock), Nugget (hidden — rock), Nugget (hidden — rock), Nugget (hidden — rock) +3 more

9. Toad Town Sewers (3F)

   Wild: Iron Cleft 35% · Lv —, Broozer 20% · Lv —, Spike Top 20% · Lv —

10. Battle School

    Trainers: Toadette (3v3 beginner) Lv 10, Toadette (4v4 Vgc beginner) Lv 18, Toadette (6v6 intermediate) Lv 28, Toadette (Wild Battle) Lv 36, Toadette (3v3 difficult) Lv 50, Toadette (4v4 Vgc) Lv 50 +1 more

★ Luigi (Piranha Plant) — World 1-1

1 Pokémon · level cap Lv 5 (every cap) · Luigi (Piranha Plant)’s own page

	Pokémon	Moves
	Piranha Plant Lv 5 · Overgrow	Pound Growl Vine Whip

★ Luigi (Blooper) — World 1-1

1 Pokémon · level cap Lv 5 (every cap) · Luigi (Blooper)’s own page

	Pokémon	Moves
	Blooper Lv 5 · Torrent	Pound Baby-Doll Eyes Water Gun

★ Luigi (Bob-omb) — World 1-1

1 Pokémon · level cap Lv 5 (every cap) · Luigi (Bob-omb)’s own page

	Pokémon	Moves
	Bob-Omb Lv 5 · Blaze	Tackle Charge Selfdestruct

Also fought around here

Everything you can have caught by this checkpoint · Open the interactive guide

It also doesn't say when Every fishing spot, Nature Reserve open up, so they are in no part above; each has its own route page.