POWER UP POKéMON
If you're looking for a way to raise your Pokémon's stats, we've got an answer-it's not for the impatient, and it only works in Red and Blue. Have a Pokémon fight until a move that it learned is out of PP. Take the Pokémon to a PC and store it, then take it right back into your party. Heal the Pokémon and check its stats. One or more of its abilities will be raised by at least one point.

Is this some form of the box trick or something else?

BTW its direcly from Nintendo Power

Well, we need to put my plan into action that I started a while back. We must think of some false rumors and cleverly spread them.

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"Salad is O-K!"- Fish

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-cfalcon

I'm pretty sure it's in G/S too.

It's probably NOT a programming error, more like a way to prevent Game Sharkers from having a huge advantage. By boxing it, all it's 'main' and 'stat' exp. are applied. This keeps all 999 stat Magikarp from beating all opponents. However, when the stats return to 'normal', where do they go? To help prevent them from quickly reaching max stats that way, the exp. is applied. Therefore, the box trick isn't really an error.

-Rain Dance

The box trick occurs because of a leak of stat experience. Stat experience was created to penalize people who use boosted exp, rare candy, or the day care to raise their Pokemon. The stat experience basically just is less gained the faster you raise.

What the programmers didn't intend to do was allow stat exp. to be reconfigured EVERY TIME it was put into the box. Instead of storing the Pokemon's actualy stats in the box, they simply store the Pokemon's stat exp, so when the Pokemon is pulled back out the stat exp. is reconfigured into raw stats. I'm pretty sure this is how it works, and to me it looks like Nintendo didn't intend to do this. I could be wrong.

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"Salad is O-K!"- Fish

Here's why their method is good:

(1) More pokémon. Storing the monster's number takes 2 bytes per value, for a total of 10 bytes. When the in-memory structure is 40 some bytes, and you're already pressed for space because of the English name, you want as little used space as possible.

(2) Glitch prevention. The programmers had probably experienced a few glitches in the design, and rederiving stats whenever a new level is reached or a monster is unpacked only makes since. If a monsters Max hit points was set to 1 via some glitch in the sytem, the ability to repair it by putting it in and out of a box is desirable: it gives the system redundancy, which is good.

Basically, the concept is that it reestablishes the order of the game by making sure the stats are correct. Most of you view the extra stats as bonus stats: that's wrong. It is merely the game correctly giving you credit for stat EXP, just as it gives you credit for having level. Simply put, if it wasn't meant to be, you couldn't gain stat EXP at L100, just as you can't gain EXP.

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-cfalcon