So A Magikarp Walks Into A Bar...

[CourageHound]

...and eats the exterminated durant corpse

So a Mamoswine walks into a bar...

 

[MelchiorFlyer]

and ends up breaking the door frame

So Giratina walks into a bar...

 

[CourageHound]

...and ends up breaking the bar

So a Scolipede walks into a bar

 

[MelchiorFlyer]

And poisons everyone's drink.

So a herd of Tauros stampede into a bar...

 

[pikakitten]

And Ash gets all derpy and catches all 30 of them. Cookie if you get the reference.

So a Togepi walks into a bar...

 

[MelchiorFlyer]

and is kicked out for being a minor
So an Albino Umbreon walks into a bar... (pikakitten can probably guess what all the TRAINERS do)

Do I get a cookie? I get the reference!

 

[pikakitten]

The anime where Ash catches 30 tauros at the Safari Zone.

And all the trainers try to catch her and she runs in a sewer. Nailed it!

So Pikakitten walks into a bar...
Or Syther, your choice...

 

[MelchiorFlyer]

So a pikakitten walks into a bar...
and Pikachu starts to attack. Pikakitten fights back and wins, gently.

So a Octillery squishes into a bar...

EDIT: p.s. You got it! :P

 

[CourageHound]

and is met up by his equally squishy freind gastrodon

So a hydreigon floats into a bar...

 

[MelchiorFlyer]

And meets a Salamence and Charizard.

So an angry Emboar walks into a bar...

 

[pikakitten]

And everyone pours Beer/Moomoomilk lol on him and he calms down and drinks it off his head as it's pouring.

So a Nucleon walks into a bar...
Or Scizor, your choice...

 

[MelchiorFlyer]

So Nucleon walks into a bar...

and Ash sees him and says "Who's that pokemon?" and the pokedex says. 'Pokemon not found.' Ash gets all derpy and tries to catch it. Then the Nucleon uses Acid on Pikachu. You get a Rayquaza if you've seen the video.

So an Eevee walks into a bar...

 

[pikakitten]

Yay! I get Rayquaza! Pikachu on Acid! Muk use Acid! Pikachu gets trippy. James: You can keep him.

And gets drunk and starts shifting through eeveelutions and so Draceon was created. No, that's not how that would be weird.

So a Caterpie walks into a bar...

 

[BR8N03epsilon]

...and evolves into Metapod and gets stuck.

So a Poliwrath walks into a bar...

 

[MrElephant]

and uses surf flooding everyone else out of the bar.

So a heracross walks into the bar...

 

[Correspondence]

...and starts licking Bulbasaurs and gets arrested.

So, a Lucario walks into a bar...

 

[MelchiorFlyer]

and gets drunk. That's when it gets ugly...

So Misty walks into a bar...

there you go pikakitten!

 

[Pink Mommy]

And kicks Dawn and May out because she's so much better.

So an Azumarill walks into a bar...

 

[Dying Light]

...and gets hit by a Shadow Ball from a random Haunter.

So a Rypherior walks into a bar...

 

[Correspondence]

..and causes an Earthquake.

So, a Mankey walks into a bar...