Hey thar, this is a thing over 2 years in the making...I just wasn't working on it for 1 and a half of those years in the middle, just recently decided to finish this. Basically there's that one episode in Code Lyoko where Odd and Ulrich fight over who's defeated more monsters so I went through every single episode and kept track, here are my results.
Monster key
K=Kankrelat
B=Blok
H=Hornet
Kr=Krabbe
M=Megatank
Ma=Manta
C=Creeper
T=Tarantula
Ko=Kongre
S=Shark
G=Guardian/simulation bubble
Ka=Kalamar
Kollossus is Kollossus
It isn't counted in the numbers but here's who defeated special monster (ie specters on lyoko, william, and evil ulrich)
Revelations- Ulrich: Polymorphic Specter
Nobody In Particular- Odd: Ulrich's body
Marabouta- Odd: Marabouta
(Um, while watching season 4 I forgot I was keeping track of this . Oh well not going back through the whole thing again)
OVERALL
Ulrich- 162
Odd- 158
Yumi- 120
Aelita- 65
William-12
Jim- 10
Jeremie-1
SEASON ONE OVERALL
Odd: 43
Ulrich: 37
Yumi: 27
Jim: 10
Aelita: 4
Jeremie: 1
SEASON TWO OVERALL
Odd- 52
Ulrich- 62
Yumi- 52
Aelita- 10
William- 1
SEASON THREE OVERALL
Odd-27
Ulrich-26
Yumi-16
Aelita- 27
William- 9
SEASON FOUR OVERALL
Odd- 36
Ulrich- 37
Yumi- 25
Aelita- 24
William- 2
SEASON 1
XANA Awakens part 1
Odd- 0
Ulrich- B:1 (this means he beat 1 Blok, just as an example)
Yumi- 0
Aelita-0
XANA Awakens part 2
Odd- 0
Ulrich- B:1 Kr:1
Yumi- B:2
Aelita- 0
Teddygozilla
Odd- K:5 M:1
Ulrich- 0
Yumi- 0
Aelita-0
Seeing is Believing
Odd- 0
Ulrich- Kr:3
Yumi- 0
Aelita-0
Holiday in the Fog
Odd- K:2
Ulrich- 0
Yumi- K:1
Aelita- 0
Log Book
Odd- 0
Ulrich- 0
Yumi-0
Aelita-0
Big Bug
Odd- M:1
Ulrich- B:3
Yumi- B:1
Aelita- 0
Cruel Dilemma
Odd- K:4
Ulrich- 0
Yumi- K:1 M:1
Aelita- 0
Image Problem
Odd- K:1
Ulrich- K:4
Yumi- 0
Aelita- G:1
End of Take
Odd- H:2
Ulrich- 0
Yumi- 0
Aelita- 0
Satellite
Odd- H:1
Ulrich- H:2
Yumi- 0
Aelita-0
The Girl of the Dreams
Odd- B:1
Ulrich- B:1
Yumi- 0
Aelita- 0
Jeremie- G:1
Plagued
Odd- Kr:1
Ulrich- 0
Yumi- Kr:1
Aelita- 0
Swarming Attack
Odd- H:1
Ulrich- H:3
Yumi- H:1
Aelita- 0
Just in Time
Odd- 0
Ulrich- K:1 Kr:2
Yumi- K:3 Kr:1
Aelita- 0
The Trap
Odd- Kr:1
Ulrich- 0
Yumi- Kr:1
Aelita: Kr:1
Laughing Fit
Odd- B:2
Ulrich- 0
Yumi- 0
Aelita- 0
Claustrophobia
Odd- 0
Ulrich- 0
Yumi- Kr:2
Aelita- Kr:1
Amnesia
Odd- Kr:2
Ulrich- Kr:2
Yumi- Kr:2
Aelita- 0
Killer Music
Odd- 0
Ulrich- B:4
Yumi- B:1
Aelita- 0
Frontier
Odd- 0
Ulrich- B:2
Yumi- 0
Aelita- 0
The Robots
Odd- B:1
Ulrich- 0
Yumi- K:2
Aelita- 0
Zero Gravity Zone
Odd- H:2
Ulrich- 0
Yumi- H:1
Aelita- 0
Routine
Odd- M:2 K:1
Ulrich- B:1 M:1
Yumi- B:1 Kr:1
Aelita- 0
Rock Bottom
Odd- H:2
Ulrich- H:1
Yumi- 0
Aelita- 0
Ghost Channel
Odd- B:5
Ulrich- B:2
Yumi- 0
Aelita- G:1
Code: Earth
Odd- B:1 M:1
Ulrich- B:1 M:1
Yumi- B:1
Aelita- 0
False Start
Odd- K:1 H:2
Ulrich- 0
Yumi- K:2 H:1
Aelita- 0
SEASON 2
New Order
Odd- T:1
Ulrich-0
Yumi-0
Aelita-0
Uncharted Territory
Odd- Kr:1 H:2 C:2
Ulrich- H:1 C:1
Yumi- Kr:1 H:3
Aelita-0
Exploration
Odd- C:1
Ulrich-0
Yumi-0
Aelita-0
A Great Day
Odd- H:2 T:1
Ulrich- Ma:1 H:4
Yumi- H:3
Aelita-0
Mr Puck
Odd-0
Ulrich-B:3
Yumi-B:1
Aelita-0
Saint Valentines Day
Odd-0
Ulrich-0
Yumi-Kr:1
Aelita-0
Final Mix
Odd- H:1
Ulrich- H:2
Yumi- M:1
Aelita-0
Missing Link
Odd- K:3
Ulrich- K:2 Ma:1
Yumi- K:1 M:1
Aelita-0
The Chips Are Down
Odd- Kr:1
Ulrich- Kr:4
Yumi- Kr:2
Aelita-0
Marabouta
Odd-0
Ulrich-0
Yumi- B:1
Aelita-0
Common Intrest
Odd- K:2
Ulrich-0
Yumi- T:1
Aelita- T:1
Temptation
Odd- H:2 T:1
Ulrich- H:2 T:3
Yumi- H:1 K:3
Aelita-0
A Bad Turn
Odd- Kr:1
Ulrich- Kr:1
Yumi-0
Aelita- H:8
William- Kr:1
Attack of the Zombies
Odd-0
Ulrich-0
Yumi- Kr:2
Aelita-Kr:1
Ultimatum
Odd- T:1
Ulrich- 0
Yumi- K:1 T:1
Aelita-0
A Fine Mess
Odd(body)- C:3
Ulrich- K:2 M:1
Yumi(body)-0
Aelita-0
XANA's Kiss
Odd-0
Ulrich- H:1
Yumi-H:6
Aelita-0
Vertigo
Odd- M:1
Ulrich- C:1
Yumi- C:2
Aelita-0
Cold War
Odd- H:2 Ma:1
Ulrich- H:3
Yumi- H:4
Aelita-0
Deja Vu
Odd- B:1
Ulrich- Ma:1
Yumi- T:1 B:1 Ma:1
Aelita-0
Tip-Top Shape
Odd-0
Ulrich- Kr:3 K:7 B:1
Yumi- Kr:1 H:2
Aelita-0
Is Anybody Out There?
Odd-0
Ulrich-0
Yumi-0
Aelita-0
Franz Hopper
Odd- C:11
Ulrich- C:6
Yumi- C:7
Aelita- 0
Contact
Odd- Kr:1
Ulrich- M:2
Yumi- 0
Aelita-0
Revelations
Odd- Ma:1
Ulrich- T:2
Yumi- Ma:1
Aelita-0
The Key
Odd- C:9
Ulrich- C:7
Yumi- C:2
Aelita-0
SEASON THREE
Straight to the Heart
Odd- Ma:2 C:1
Ulrich- Ma:2 C:3
Yumi- Ma:1
Aelita- C:1
Lyoko Minus One
Odd- T:3
Ulrich-0
Yumi-0
Aelita-0
Tidal Wave
Odd- H:1 Ma:3 T:2
Ulrich-0
Yumi- H:1
Aelita- Kr:2 H:1 C:1
False Lead
Odd- M:1
Ulrich-0
Yumi- M:1
Aelita: M:1
Aelita
Odd- C:2 Ma:1
Ulrich- B:1 C:3 Ma:1
Yumi- H:2 B:1 Ma:1 C:1
Aelita- C:4 Ma:1
The Pretender
Odd- Kr:1
Ulrich- Kr:4 H:3 Ma:1
Yumi-0
Aelita- Kr:1 H:2
The Secret
Odd- K:2 B:1
Ulrich- K:4
Yumi- M:1
Aelita- K:6
Temporary Insanity
Odd- Ma:2
Ulrich- Ma:2
Yumi- Ma:2
Aelita- K:2 T:1 Ma:1
Sabotage
Odd- 0
Ulrich-0
Yumi- Kr:1
Aelita- T:1
Nobody in Particular
Odd- Ma:1
Ulrich-0
Yumi- Ma:1
Aelita- Ma:1
Triple Trouble
Odd- M:1 B:2
Ulrich- B:1 M:1
Yumi- B:2
Aelita- B:1
Double Trouble
Odd- K:1
Ulrich-0
Yumi-0
Aelita-0
Final Round
Odd-0
Ulrich-0
Yumi- C:1
Aelita-0
William- C:9
SEASON FOUR
William Returns
Odd- Ma:1
Ulrich- Cr:1
Yumi- Cr:3
Aelita-0
Double Take
Odd-0
Ulrich-0
Yumi- T:1
Aelita- T:2
Opening Act
Odd- Kr:2 Ma:1
Ulrich- Kr:1
Yumi-0
Aelita-0
Wreck Room
Odd- T:1
Ulrich-0
Yumi-0
Aelita- T:2 Kr:1
William: Kr:2
Skidbladnir
Odd- Cr:3 Ma:2
Ulrich-0
Yumi-0
Aelita- Ma:1
Maiden Voyage
Odd-0
Ulrich-0
Yumi- Ko:1
Aelita-0
Crash Course
Odd- B:2
Ulrich- Kr:3
Yumi-0
Aelita-0
Replika
Odd-0
Ulrich-0
Yumi-0
Aelita- M:1
I'd Rather Not Talk About It
Odd- Ma:1
Ulrich-0
Yumi- Ma:3
Aelita- Kr:3
Hot Shower
Odd-0
Ulrich- K:1
Yumi-0
Aelita- T:1
The Lake
Odd-0
Ulrich-0
Yumi- Kr:2
Aelita-0
Lost at Sea
Odd- Ko:2
Ulrich- Ko:2
Yumi- Ko:2
Aelita-0
Lab Rat
Odd-0
Ulrich- T:1
Yumi- T:2
Aelita-0
Bragging Rights
Odd- H:2
Ulrich-0
Yumi-0
Aelita-0
Dog Day Afternoon
Odd- B:3
Ulrich- T:3
Yumi-0
Aelita-0
A Lack of Goodwill
Odd- H:3
Ulrich- S:2
Yumi- H:2 T:1
Aelita-0
Distant Memory
Odd- T:1 B:1 Ma:1
Ulrich- T:1
Yumi-0
Aelita-0
Hard Luck
Odd- H:2
Ulrich- K:10
Yumi- K:2
Aelita- H:2
Guided Missile
Odd-0
Ulrich- Kr:2
Yumi- Kr:2
Aelita-0
Kadic Bombshell
Odd-0
Ulrich-0
Yumi- K:1
Aelita- B:1 K:2
Canine Conundrum
Odd- Ma:1 T:2
Ulrich-0
Yumi-0
Aelita- S:1
A Space Oddity
Odd-0
Ulrich- C:1
Yumi-0
Aelita-0
Cousins Once Removed
Odd- S:1 Ka:1
Ulrich- S:2 Ka:1 T:1
Yumi- Ka:1
Aelita- T:1
Music Soothes the Savage Beast
Odd- K:2 Ma:1
Ulrich-0
Yumi-0
Aelita- K:1 B:1
Wrong Exposure
Odd-0
Ulrich- Kr:1
Yumi- Kr:1 T:1
Aelita-0
Bad Connection
Odd-0
Ulrich- Kr:1
Yumi- Kr:1
Aelita- Ma:2
Cold Sweat
Odd-0
Ulrich- T:1
Yumi-0
Aelita- M:1 T:1
Down to Earth
Odd-0
Ulrich- Ma:1
Yumi- Ma:1
Aelita-0
Fight to the Finish
Odd-0
Ulrich- Kollosus: 1
Yumi-0
Aelita- Ma:2
Echoes
Odd-0
Ulrich- 0
Yumi-0
Aelita-0
So there you have it, it's exactly what you'd expect it to be xD
Please please give me some kind of feedback on this it took me a really long time use it as a refrence or something idk
-throws this contribution to the fandom at you and scurries off-