Oh them. Liza and Tate I think it was, a lot of people seem to have trouble with them but most times I've fought them I just surfed them out of my way. I've also been going through the game with the Macho Brace equipped, if you're familiar with the game dynamics, it doubles the amount of EV's my team get.
Basically, it makes them stronger than Pokemon at my level without it. I'm sure I'll be fine.