Okay let's try reverse logic.
Everyone single person, use a Garchomp yourself. And if or when you lose, take note of how they did it. That's your answer. However faulty that logic may be, it sure as hell beats everyone acting like they're allergic to Garchomp
Chomp is overrated. Its possibly the strongest poke in OU, but not uber.
Not like sticking Ice moves all over your team is overcentralizing. You still need to worry about Salamence, Dragonite, everything else ice hits.