Location: Play a game of Dice-A-Roo and you will randomly get this challenger.
Difficulty: 130
HP: 160
HP Gain Per Win: 12

Location: Random event at Deserted Fairground.
Difficulty: 320
HP: 320
HP Gain Per Win: 30

Location: Random event on Neopets.
Difficulty: 15
HP: 15
HP Gain Per Win: 1

Location: Random event at Cave Paintings.
Difficulty: 58
HP: 58
HP Gain Per Win: 5

Location: Automatic challenger in the battledome.
Difficulty: 10
HP: 10
HP Gain Per Win: 1

Location: Random event in the Ruins of Maraqua.
Difficulty: 500
HP: 500
HP Gain Per Win: 60

Location: Random event in the Space Station.
Difficulty: 120
HP: 120
HP Gain Per Win: 12

Location: Random event on Neopets.
Difficulty: 90
HP: 90
HP Gain Per Win: 7

Location: Random event on Neopets.
Difficulty: 75
HP: 75
HP Gain Per Win: 10

Location: Random event when completing her Quests.

Only battles at 12-1 AM NST.
Difficulty: 80
HP: 60
HP Gain Per Win: 5

Location: Go to Kreludor and you will get this challenger on first try.
Difficulty: 85
HP: 100
HP Gain Per Win: 12

Location: Automatic challenger in the Battledome.
Difficulty: 40
HP: 50
HP Gain Per Win: 2

Location: Get this Challenger by going to this Neohome.
Difficulty: 32
HP: 32
HP Gain Per Win: 2

Location: Go to the News on October 31, 2003 and you will have this challenger.
Difficulty: 250
HP: 250
HP Gain Per Win: 17

Location: Refresh at the Giant Omelette to get this challenger.
Difficulty: 350
HP: 350
HP Gain Per Win: 40

Location: Go to the Tyrannian Town Hall and you will get this challenger.
Difficulty: 100
HP: 140
HP Gain Per Win: 12

Location: Automatic Challenger
Difficulty: 35
HP: 35
HP Gain Per Win: 3

Location: Automatic Challenger
Difficulty: 58
HP: 61
HP Gain Per Win: 5

Location: Automatic Challenger
Difficulty: 1
HP: 1
HP Gain Per Win: 0

Location: Go to his Gallery of Evil page and you will get this challenger.
Difficulty: 125
HP: 150
HP Gain Per Win: 10

Location: Random Event when refreshing at this User Lookup.
Difficulty: 400
HP: 400
HP Gain Per Win: 42

Location: Buy his collectable card to get him.
Difficulty: 38
HP: 38
HP Gain Per Win: 6

Location: Go to her Neopedia article.
Difficulty: 70
HP: 71
HP Gain Per Win: 6

Location: Random event at The Ruins of Maraqua.
Difficulty: 62
HP: 65
HP Gain Per Win: 6

Location: Refresh at the Laboratory twice but you must have Lab ray access first.
Difficulty: 185
HP: 200
HP Gain Per Win: 19

Location: Random event, though you might get this challenger at the Wheel of Excitement.
Difficulty: 61
HP: 120
HP Gain Per Win: 7

Location: Refresh at the Volcano.
Difficulty: 85
HP: 94
HP Gain Per Win: 9

Location: Refresh at the Trap Door under Peopatra's PetPet shop.
Difficulty: 150
HP: HP175
HP Gain Per Win: 15

Location: When your pet gets Sneezles or Neoflu, go to the Quick Ref page to get this challenger.
Difficulty: 60
HP: 75
HP Gain Per Win: 7

Location: Automatic Challenger.
Difficulty: 375
HP: 375
HP Gain Per Win: 40

Location: Go here to get this challenger.
Difficulty: 42
HP: 45
HP Gain Per Win: 4

Location: He has to steal something from your inventory, and then you get Pant Devil as a challenger.
Difficulty: 21
HP: 22
HP Gain Per Win: 2

Location: You can find Plumbeard in one of the rooms at Cap'n Threelegs' Swashbuckling Academy.
Difficulty: 260
HP: 275
HP Gain Per Win: 25

Location: Automatic challenger. Never fights back.
Difficulty: 0
HP: 5000
HP Gain Per Win: 0

Location: Punchbag Bob's evil twin. If you fight him, withdraw as soon as possible!
Difficulty: 100
HP: 2000
HP Gain Per Win: 20

Location: Win any battle with a Quiggle.
Difficulty: 69
HP: 73
HP Gain Per Win: 7

Location: Refresh here
Difficulty: 550
HP: 550
HP Gain Per Win: 50

Location: Automatic challenger.
Difficulty: 150
HP: 250
HP Gain Per Win: 9

Location: Go to his Neopedia Article.
Difficulty: 250
HP: 250
HP Gain Per Win: 25

Location: Random event in the Tyrannian Plateau.
Difficulty: 79
HP: 89
HP Gain Per Win: 7

Location: Random event on Neopets.
Difficulty: 175
HP: 150
HP Gain Per Win: 25

Location: Win a Level 3 or higher prize at the Deserted Fairground Scratchcard Kiosk.
Difficulty: 84
HP: 84
HP Gain Per Win: 9

Location: Go here with Slug Flakes in your inventory and refresh.
Difficulty: 500
HP: 500
HP Gain Per Win: 45

Location: Refresh MANY times at the Advent Calendar.
Difficulty: 300
HP: 300
HP Gain Per Win: 30

Location: Complete her quest within the time specified and get the items she needs.
Difficulty: 105
HP: 120
HP Gain Per Win: 9

Location: Redeem a Rare-Item code at the Grundo's Warehouse. If that doesn't work, get 100 referrals, but don't make accounts yourself just to get the challenger.
Difficulty: 450
HP: 550
HP Gain Per Win: 45

Location: Go to his Gallery of Evil page.
Difficulty: 175
HP: 200
HP Gain Per Win: 15

Location: Random event on Neopets. Will steal 10% or 25% of the NP you have on hand, but if he does that, you get this challenger.
Difficulty: 85
HP: 90
HP Gain Per Win: 8

Location: Go on a Tiki Tour to get this challenger.
Difficulty: 120
HP: 150
HP Gain Per Win: 12

Location: Random event on Neopets.
Difficulty: 89
HP: 93
HP Gain Per Win: 8

Location: Finish one of his Quests. (You need to complete two Esophagor quests to complete one Brain Tree quest.)
Difficulty: 91
HP: 105
HP Gain Per Win: 8

Location: Finish one of his Quests.
Difficulty: 49
HP: 53
HP Gain Per Win: 4

Location: Visit his Cave when he is sleeping and get blasted.
Difficulty: 650
HP: 700
HP Gain Per Win: 65

Location: Visit his Shop.
Difficulty: 63
HP: 60
HP Gain Per Win: 6

Location: The Turmaculus has to eat one of your petpets when he is awake.
Difficulty: 255
HP: 240
HP Gain Per Win: 22

Location: Random event on Neopets.
Difficulty: 80
HP: 80
HP Gain Per Win: 8

Location: Refresh at the Dark Catacombs.
Difficulty: 39
HP: 42
HP Gain Per Win: 3