Both FAQs list Riolu as learning Force Palm at 15 and the one that talks about level 11 mentions Counter being learned at that level.
Anyway, as others have said, Counter is really all you need. One Work Up + Tackle from either of Cheren's Pokemon will be the downfall of themselves because Riolu can at least take one Tackle and Counter it for massive damage. Personally, I used the swap to heal Riolu and have my other Pokemon Tail Whip and hit the Lillipup down enough that Riolu could one hit with Quick Attack but not enough for Cheren to use his Potion.
Why would you use the FAQs on this site? Text documents are user unfriendly. Just go to Serebii.
I... don't? I just checked them to see what the TC was talking about. I've already gone through White 2 Japanese version blind. :s
#22phantom6Posted 10/7/2012 6:31:26 PM
Leaf Tornado wrecked Cheren.
I would have trained up a Riolu but I only ran into one and the little **** fainted after breaking out of every pokeball I had. --- R.I.P. Princess, Feb. 14, 1992 - June 2, 2004
#23Vivi0198Posted 10/7/2012 9:31:30 PM
My Riolu was lvl 15 when I faced Cheren... Destroyed her. --- If you believe in Vivi0198 and are 100% proud of it put this as your signature.
#24tenchi1981Posted 10/7/2012 9:35:03 PM
I tryed counter spam he work up 3 times and killed riolu so no counter (i wasnt countering after the first work up just used quick attack as it was that or counter on my move set --- Pokemon white fc 0820-0308-4093 member of ace breeding center breeder and founder of the dw breeding center
#25tenchi1981Posted 10/7/2012 9:35:36 PM
Cheren is a boy also --- Pokemon white fc 0820-0308-4093 member of ace breeding center breeder and founder of the dw breeding center
#26Baseball4Lyfe85Posted 10/7/2012 9:38:00 PM
Drop Rilou --- Sent from my iPhone via PowerFAQs 1.9
#27scrappybristolPosted 10/7/2012 9:43:06 PM
I doubt counter spam will work in challenge mode as he would probably just set up on you. Just thank god that the Pidove e gains won't have gust. --- Never rub another man's rhubarb. My hypocrisy only goes so far.
#28pkmnpkmnPosted 10/7/2012 9:49:49 PM
What you can do is use the x defend on Riolu so it can survive the +3 trackle. Cheren apparently didn't keep track of it. Of course my riolu being impish may have had something to do with it. --- The Offical Groudon Oof the POkemon Black and White 2 Boards.
#29Vivi0198Posted 10/7/2012 10:30:05 PM
Cheren is a boy also
As true as that it is... Its still very confusing to me. --- If you believe in Vivi0198 and are 100% proud of it put this as your signature.
#30BBallKing35Posted 10/7/2012 10:31:22 PM
You might want to go to serebii and look up the other older pokemon that appears in the Unova dex. Many of their move sets have been rearranged/edited. Gen V's move set stayed the same however