Here she is, the beauty, the best mence partner since ttar/exca, the most stressful 50/50 you will ever find yourself in during team preview...
This isn't an explicit endorsement of Gothitelle, although honestly if all you want to do is trap Celes and Ferrothorn, Gothitelle is definitely your lady. She is terrible against any offensive team, she is so helpless after killing things that any trap kill is basically a 1 for 1, her speed tier is, while not terrible, nothing to write home about.
do you know what she DOES do though? lives ANY coverage celesteela has INCLUDING earthquake and flamethrower, can TRAP the steel demon, has a coverage move that hits pretty goshdarn hard vs celes(wearing it down sufficiently so that any mon that celes used to wall doesn't really wall it anymore!, and can (if youre cheeky enough to even try) trick it if you think it'll go for something stupid.
Gothitelle @ Choice Specs
Ability: Shadow Tag
Level: 50
EVs: 12 HP / 4 Def / 252 SpA / 4 SpD / 236 Spe
Timid Nature
IVs: 0 Atk
- Hidden Power [Fire]
- Psychic
- Thunderbolt
- Trick
I used this specifically to aid physical m-mence as much as humanly possible, so the coverage and speed investment is tailored to that as much as I can possibly make it. Outspeeds max speed celesteela and things that creep it by 1 point, such as tapu fini. Its purpose is simple, its coverage is specific, and its offensive presence is actually pretty decent.
It's capable of lopping a decent chunk of celes's health off...
252 SpA Choice Specs Gothitelle Thunderbolt vs. 252 HP / 0 SpD Celesteela: 124-148 (60.7 - 72.5%) -- guaranteed 2HKO
While also having the capacity to go for Trick to permanently incapacitate it for the rest of the match. This is capable of switching into the beast and lop a chunk of its health...
0 Atk Celesteela Heavy Slam (120 BP) vs. 12 HP / 4 Def Gothitelle: 72-85 (48.9 - 57.8%) -- 96.5% chance to 2HKO
0 SpA Celesteela Flamethrower vs. 12 HP / 4 SpD Gothitelle: 34-40 (23.1 - 27.2%) -- 49.7% chance to 4HKO
0 Atk Celesteela Earthquake vs. 12 HP / 4 Def Gothitelle: 39-47 (26.5 - 31.9%) -- guaranteed 4HKO
Although it technically can come in on a heavy slam and do a chunk to it, I'd recommend it come on a protect or a coverage move. I've had a moderate success pairing it with celes maro instead of mence, just to win the celes ditto so much easier than celes maro can do alone. Generally, virtually anything with a weakness to one if its coverage moves can use it, such as m-scizor, tapu bulu, and excadrill, all things that wish celes to be done away with.
Goth isn't a fantastic mon in many many regards, but if the people don't want to vote for my favorite magnetic boy because it's too easy... the people will be satisfied.