Zapdos also has to worry about rocks. You can't consistently switch in since unless your rock setter is called Hydreigon or Excadrill, u won't be able to put rocks(Hydrei scares Espeon enough to not switch in and excadrill is Mold Breaker) without it being deflected back.
Weezing is a pain for those teams but he has to watch out for espeon using future sight for them or else he would be killed easy.
Volca QD + WoW is another one that rely on not having rocks, and no Giga Drain means you won't touch easily Water types. Remember, isn't only with Dug's matchups you has to worry about.
Serperior has to give up their valuable HP Fire. That's disgusting and you will have a hard time vs Skarmory and Scizor(Depending on scenario the opponent can even afford let them on front of serp and beat them before it's beaten.)
Sub + CM means the opponent won't have chande trick so other Serp variants after rocks can actually beat Chandelure with two leaf storms if you dare to switch in. Again, isn't this matchup the only you'll have to worry.
Suicune with toxic gives up a lot. Basically you lose the option to beat a Breloom before it can kill Suicune with Bullet Seed, Amoongus became a pain with spore + Clear Smog, etc...
The others can be interessing choices.