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

[Richard & Sableye]

Picking a chimchar is probably one of the worst mistakes

[SirBlaziken]

Taking challenges that involve beating CPU opponents with ridiculous teams that'll never work ~looks at RioluRiku and ShinyBlaziken2000~

Well, I gave him a challenge he can't refuse!

[Madkip]

let your charmander swim in the swimming pool

[spritey]

Eating an omelette is a bad move in pokemon. 95 % chance you're eating Exeggcute/Day Care Egg. And don't even get me started on eating a Bad Egg...

[Wistful]

Misclicking "Run Away" after encountering a shiny.

Battling in the ocean against a swimmer with a Rapidash.

Hugging a Ferrothorn.

[Lemonheads]

Using false swipe on a shedninja. 3 reasons
1. Already has one hp
2. Not supereffective
3. It's ghost type

[Jackogirl]

Raising a team of all fire-types, and then battling against me!

[SirBlaziken]

Picking Chikorita, any of the Sinnoh starters (except Chimchar), or Snivy as a starter Pokemon. I hate all of those.

You mean picking chimchar (big mistake) and not picking torchic.

[Stmacl]

Letting Wailord use body slam...

[Captain Jigglypuff]

Letting Wailord use body slam...

LOL!!!!!!!!!!!!!!!!!!!!! I LOVE the look on Pikachu's face!!!!!! Where'd you get that pic?!!!!

[Stmacl]

Just google Wailord used body slam tis funny!!

[Draghost999]

Having sex with toxicroak.

Owning a Dewott or an Arcanine.

[Stmacl]

Jumping down a ledge followed by a Groudon in SoulSilver.

Catching a Caterpie in a master ball then showing it off like it's a great achievement.

[Draghost999]

kissing gloom.
mistaking dusknoir for a frige.
taking off machokes belt.
taking off jynx's bra.

[SirBlaziken]

Making eye contact with people. they will yell at you and attack you with creatures.

Guilty as charged.