I found defensive Pachirisu (252HP,252Def/Bold) with Ion Deluge @terrain extender to be quite good. Ion deluge grants priority terrain setting, with super fang and nuzzle as support, and u-turn/ volt switch as a slow pivot to get in a more fragile sweeper, like a-Raichu. Only 6 turns of terrain though, so you may need to bring in Pachi twice, or complement with a second terrain setter.
but I can also see togedemaru pull its weight.