Going down the list of A and B-ranked pokemon, it also walls (and can win 1v1 against) Seismitoad, Uxie, Musharna, Exeggutor, Ludicolo, Mismagius*, Pyroar**, Rotom, Claydol, Gourgeist, Haunter, Lanturn, Quagsire, Rotom-Fan, and Mantine.
Taking hits from Camerupt is just a bonus.
*It can...