
True, but "BS" (bullshit) refers to battle outcomes which are contrived or unbelievable. The Pikachu vs. Pikatwo confrontation (it barely qualifies as a battle) was born of particularly nasty circumstances, so I find the painfulness of it very appropraite.
Anyway, the BS victory which always springs to mind for me is definitely still Ash vs. Mandy. My sympathies are very firmly with Mandy. Nobody deserved to lose so direly to a pokemon Ash had scarely even interacted with before, no matter how much of an arrogant douche they are.

I would say the majority of battles where Ash is involved. It's a VERY large list.
Once upon a time there was a leafeon. There wasn't anything special about him. He was just a regular leafeon. The End.
Shaymin (Sky) claimed 3/5/2012
Lum Berry and Mach Bike claimed 21/12/2012

Not sure if this counts as a fight but Brock's Happiny with its impossible amount of strength. I think the only battles it was in were against Team Rocket and the episode where a girl likes Pokemon that are cute but I think it was because of TR that we didn't get to see that battle end or did we I can't remember.
Anyway it was kind of ironic to finally give Brock a female that he can't handle haha
I know this will be talked about so Ash vs cameron. Hahah that battle was just stupid.
Ash vs Trip in the first episode of BW.
...losing to a brand new Snivy that probably just hatched. Seriously.
Dangerous Circus

Ash vs Cameron. nuff said...
Ash vs Brock. That. Was. Complete. BS. Getting watered does NOT remove your Electric immunity. And don't try to argue, that did NOT count as a Soak attack.
Ash vs Tate and Liza. Thunder Armor? Really? That would have made Swellow faint, not supercharge him!
Ash vs Wattson. Not even all the Pokerus in the world can justify that "overcharge".
Oshawott vs. anything with a type advantage. That is NOT how a scalchop works.
Anything in DP that involved Ash's Staravia. GTFO with the Gusting!

Chalk one up for ash vs cheren
Ash vs Trip (first two battles)
Ash vs Wattson
Ash vs Tate/Liza
Anything with Infernape
It seems like most are missing the point of Ash in the anime and just calling outsmarting an opponent BS. Seems a little unfair to me.
The first battle between Ash and Trip was fairly BS though.
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