[Anime] Ash and the Elite 4

Not just set to see Bertha, he's

 These are actual spoilers

set to face Bertha's Hippowdon with his Torterra, and most likely lose.

You'll notice there's a trend of him losing to the Elite 4.

I know about the Bertha stuff, and I probably should have mentioned whom he lost to.

From those he's actually seen:

Kanto: Lost to Lorolei (Prima in the anime), never battled Bruno nor Lance, lost to Agatha, and won/lost to Blue/Gary Oak (they've had many battles).

Johto: Never battled Bruno nor Lance.

Hoenn: Lost to Drake, never battled Steven nor Wallace.

Sinnoh: Never battled Aaron, got owned by Flint (Flint's Infernape killed Ash's Pikachu, Buizel, and Infernape), never battled Lucian (although Lucian did beat Dawn's Buizel, which would soon become Ash's), Cynthia never battled Ash (although she owned 4 of Paul's Pokemon with only her Garchomp, and since Paul beat Ash, we can assume that he too would get owned by Cynthia), and is probably going to lose against Bertha.