I do not claim to know much of anything about the Subway, but I am curious about one thing: Why Garchomp? Latios hits just as hard, has better speed, doesn't get the various physical downsides (burn, intimidate, on-hit abilities), can run mixed very effectively through Psyshock, and can use Trick or Memento. It also wrecks Poliwrath and Toxicroak too. Given that I couldn't get past a 50 or so in D/P, I know I must be missing something, but I'm puzzled as to what.