In Episode 15, and in my first playtrough, Samson was a nightmare.
Like, I had Pidgeot (Quick Feet i guess), Sceptile (Unburden), Donphan (Sturdy), Toxicroak (Poison Touch), Skuntank (Aftermath) and Hawlucha (Unburden ?), he still beat me each time I fought him. (I never beat him so I started a new playtrough)
Well, in my actual playtrough (second) I crushed him though. My team was composed of Noivern (Infiltrator), Honchkrow (Moxie), Purugly (Defiant), Skuntank (Stench), Serperior (Contrary w/ Leaf Storm) and Toxicroak (Poison Touch). It was pretty easy.