Then you're either too young to understand, or too new to the series to understand.
Not trying to insult you, but for whatever reason you truly can't understand.
This isn't like a sibling deleting your save by accident, or a vengeful friend releasing your star pokemon, or even a parent throwing your game out... In those situations, you have someone to blame. There's somewhere to redirect your anger and frustration, someone to push your sorrow and pain on to... When this happens though? When things you can't control happen, and nobody caused it... That cartridge held time, effort, energy, and memories. It held countless hours and care for each of your pokemon. Pokemon who were your friends. Yes, the were only sprites on a screen, but they were your friends. They were as real as the kids you played the games with.
And now that's all gone.
Every minute spent, every long night, every struggle, every encounter...
And every friend...
Gone.
Lost.
Taken from you.
And nobody to blame. No one to take it out on, nobody to redirect your rage at. Nobody to fall against and hold accountable for the loss you've just suffered.
It's an illness with no cure...