PokeBase - Pokemon Q&A

# What are the biggest and smallest Magikarp you can find in Pokemon HeartGold and SoulSilver?

So, I think any HG/SS player will remember that in Mahogany Town there was a fisherman who asked you to show him the biggest Magikarp you could find. I also think HG/SS player will remember trying to fish for a Magikarp that was extravagantly large in size (I had the HG/SS Player's Guide, so I tried to find a Magikarp at least the same sizes as the ones that they found).

So, I'm just curious as to what the maximum and minimum sizes of Magikarp were found.

edited

It's actually not dependant on location. It's dependant on Magikarp's personality value.

I'll try to make sense of the calculation:

Personality values are assigned by a 32 digit bit that determine some characteristics of the Pokemon. They are split into 4 different parts. (00000000 00000000 00000000 00000000). For the calculation of how big a Pokemon is, the last 2 parts are used.

The formula to calculate a portion of the size is:

>s = ( ( (Atk' ⊕ Def') HP' ) ⊕ p1 ) 256 + ( ( (SpAtk' ⊕ SpDef') * Spd' ) ⊕ p2 )

Where p1 is the last 8 %256, rounding down, while p2 is the second to last eight digits divided by 256 and then taking the modulo.

Then, the s you obtain is used to obtain the an x, y, and z values:

Afterward, using the obtained values, as well as h, the Pokemon's height in meters rounded down:

>Size = Rounddown( (s-z) / y + x ) * h / 10

td;lr: It's pretty much luck, although if you can manipulate RNG somehow, you might get better luck.

Source

And by the way, it's Lake of Rage, not Mahogany Town :)