Usage comparison list for November and December, both lists adjusted for species clause(all rotom appliances are one pokemon).
Green means that pokemons usage rose,
red means it dropped,
blue means a pokemon rose 5 spots or more.
NA means there was no change.
Actual usage differences are rounded to the nearest 500, or 100 if the change was less than 500.
Less than 100 is listed as NA, no change.
I had to adjust this list after I realized that counting rotom as five pokemon created an inaccurate list.
01 Scizor _________NA, -500
02 Heatran ________NA, -500
03 Salamence ______NA, -3,000
04 Tyranitar _______NA, +2,500
05 Gyarados _____+2, +5,500
06 Zapdos ________-1, -5,000
07 Blissey _________-1, -300
08 Infernape _____+1, +300
09 Lucario _________-1, -7,000
10 Rotom-P ______+1, -5000
11 Gengar _________-1, -5,000
12 Metagross ______NA, -6,500
13 Swampert ______NA, -2,000
14 Bronzong _______NA, +250
15 Celebi ________+1, +3,500
16 Jirachi ________+8, +18,500
17 Azelf ___________-2, +500
18 Starmie _________-1, +6,000
19 Vaporeon ________-2, -1,000
20 Machamp_______+3, +4,000
21 Suicune __________NA, +1,000
22 Kingdra __________NA, +1,500
23 Gliscor_________ +2, +2,500
24 Breloom _______+9, +6,000
25 Togekiss _______+1, NA
26 Skarmory ________-7, -4,000
27 Weavile ________+1, +2,000
28 magnezone _____+8, +3,000
29 Electivire _______+1, NA
30 Flygon _________+9, +6,000
31 Mamoswine _______NA, -1,000
32 Snorlax __________-5, -2,500
33 Hippowdon _______NA, -500
34 Aerodactyl _____+2, +4,000
35 Heracross ________NA, -500
36 Forretress _______-7, -5,500
37 Cresselia ______+4, +1,000
38 Jolteon ________+5, +3,500
39 BANNED! _______-22, -19,000
40 Dusknoir _________NA, NA
41 Tentacruel_______ -7, -4,000
42 Rhyperior ________-4, -1,500
43 Dragonite ________-1, -2,500
44 Porygonz _________NA, +500
45 Ninjask ________+1, +500
46 Empoleon ______+4, +1,500
47 Dugtrio __________-2, -1,000
48 Alakazam ________-1, -500
49 yanmega ______+5, +1,500
50 donphan _________-2, -1,000
The top 10 has pretty much stabilized, with Rotom finally bumping out Gengar. Guess bulky is better than fast. Rotom's rise to power is imo directly responsible for Lucarios drop and Infernape' rise. Lucario has to give up priority or coverage against flying to cover rotom, while mixapes overheat does fine.
Jirachi rises 8 spots to #16 thanks to the popularity of the scarfhax set and brings its counter magnezone with it, who also rose 8 spots to #28. Jirachi had the greatest increase in actual usage, with 18,500 more uses than in November.
Breloom rises 9 spots to #23, an indirect result of rotoms rise to power, which made stall viable again. Breloom is a great wall breaker and people are remembering that. Its also a great counter to tyranitar, who is number 4.
Flygon rises 9 spots to #30 as the scarf set is proving to be a great anti-metagame pokemon, taking advantage of the banning of scarfchomp (scarf-flygon is still way more balanced than scarf-chomp).
Jolteon rises 5 spots, though it's stll 9 places behind its physical equivalant, electivire.
Skarmory and Forretress both drop 7 spots. I don't know what that means, but it's interesting.