I thought that the most obvious route given the choices was bulky volt-turn to give mawile and chomp the best switch-in opportunities possible to do their thing. Rotom and Landorus served as the foundation to this while mandibuzz was added because bisharp sucks and I needed something real bulky to not only defog but also pivot a bit. Gothitelle is probably my fav on this team because it has so much fantastic utility alongisde mawile and chomp. It can easily trap and eliminate skarm, lando, (insert wall here) because of the volt-turn nature of the team. Especially with scarf lando, the opponent is placed in a very frequent "switch to skarm and risk geting trapped or stay in and die" 50/50. Once the counters are eliminated, I can volt-turn right to mawile or chomp to wreak havoc.
I chose a sub mawile set so that it isn't useless early game when things like skarm still exist. It can sub up on obvious switches and do quite a bit of damage. It's much easier than trying to guess the opponent's playstyle/skill level on the ladder and then risk double switching and the like. Chomp really only required 2 move coverage with goth support, and so he was given an early-game purpose as well with stealth rock. Without these two quirks, mawile and chomp would have been useless, if not a liability until later on the match.
Scarf lando provides a bit of speed to the rather slow team and lends itself to creating many of the aforementioned 50/50s involving goth. Rotom packs twave instead of willo because mawile and chomp both appreciate the paralysis support greatly. Mandibuzz is probably the most passive member of the team, but it gets the job done. It can deal with bisharp moderately well and defogs if need be, though the team itself is not incredibly vulnerable to hazards to begin with. It also provides a well needed counter to things like breloom who otherwise tear away at a slower team like this
Here's a replay from around the 1800's. iffy playing from both sides, but you get the idea.
http://replay.pokemonshowdown.com/ou-100053202
Note: the whole end debacle is because lando can only ko from below like 78%. also I didn't mean to kill swampert at the beginning.
http://replay.pokemonshowdown.com/ou-100065709
Here's another one. More one sided, but mawile gets extra play time.