You might have a bit of trouble depending on what types you're running with. Closer to 50 and you should pretty much be safe. http://www.gamefaqs.com/portable/ds/game/960100.html
I did it at 42 for R1 and 48-52 for R2. Try if you dare! I'd say 50-55 for a comfortable sweep for R1, and 70+ for the same result for R2.
Stock up on items and deposit the rest of the cash in case you lose... Full Restores ARE nice, but expensive. None of your Pokes will have over 200 HP, so Hyper Potions, Full Heals and Revives will do.
thanks for the ehads up my team consits of megnium, rapidash, noctowl, poliwhirl, suudowoodo, and amphoros