Due to the type disadvantage he's going to have a few Pokemon that get boned pretty hard in either match. While Gliscor gets destroyed by Ice moves it takes neutral damage from grass, iirc there is only one non-legend grass type that out-speeds Gliscor (Sceptile) and with SD and Fly-ing move he could do hard damage to the Grass Team.This makes me facepalm since he said his roommates are running grass and ice. The only thing I would recommend at this point would be Hippowdon for auto Sandstorm since it can only benefit you for the most part (once you get the national dex or whatever).
Meanwhile Quagsire, with its near Swampert defenses is going to take fuck-all from ice type moves. Toss in a few Amnesias or Curses and team Ice is in trouble. Think outside the box before you start immediately hating please.