Worst mistake to ever make in the Pokémon world...

[SilverHeartStar]

Just post whatever you think would be the worst to do in the Pokémon world. I'll start...

Making a 'your mom' joke in front of a Cubone.
Asking Darkrai for some help sleeping.
Letting a Lucario hug you from behind.
Making Uxie stare into the back of a Shedinja.

Any more?

[Utack and Swampy]

Entering the Lavander town Pokemon tower without a Sliph Scope seems like an unwise move...

[Afro-Disiak]

So I heard pulling one of Ninetales' tails curses you or something.

[Spinner]

Taking your DS with you on holiday and forgetting your charger?

[saacool]

bringing digimon with you

[Specstile]

Using a ranger stylus on your mother

[LionWhyte]

Abusing a Magikarp....

[aer_dingus]

 mistaking a voltorb for a pokeball.

[HipHop Honchkrow]

Make a Mankey or fellow Primeape Upset

[Mr.Mewtwo]

Riding on a Giratina's wing.

[aer_dingus]

actually buy a magikarp from that one guy.

[Liam]

^But Gyarados is cool! O:

[Hahex and Oshawott]

actually buy a magikarp from that one guy.

totally guilty.

Try to kill a shedninja with a tackle attack

[Petzbreeder]

Try to kill a shedninja with a tackle attack

Try to "finish it off with false swipe" aswell.

[Richard and Blaziken]

Picking Chimchar. Also, not picking Torchic is equally as bad, if not worse.