RMT

[cmg474]

This is my first RMT, hopefully this team is ok...

Gengar @ Magnifying Glass
Modest (+SpA, -Atk) (Would Timid be better?)
6 HP, 252 SpA, 252 Speed
Shadow Ball
Thunder
Focus Blast
Hypnosis

I’m not entirely sure but I think Magnifying Glass raises accuracy by 30%, giving Thunder, Focus Blast, and Hypnosis 91 Accuracy, more than enough to hit almost all the time. Nice special sweeper. Leftovers isn’t great on sweepers, so I think this item would be the best choice…

Milotic @ Leftovers
Bold (+Def, -Atk)
210 HP, 252 Def, 48 SpA
Surf
Ice Beam
Toxic
Recover

Maybe Starmie would be better here? Not sure though.

Weavile @ Choice Band (Maybe a different item...)
Jolly (-SA +Spd)
6 HP, 252 Atk, 252 Spd
Pursuit
Ice Punch
Night Slash
Brick Break

Garchomp @ Choice Band (Maybe a different item...)
Adamant (+Atk, -SpA)
6 HP, 252 Attack, 252 Speed
Outrage/Dragon Claw
Earthquake
Crunch
Fire Blast

Undecided on the Dragon move, leaning toward outrage but I would like to hear what you people have to say.

Gliscor @ Leftovers
Impish (-SA +Def)
252 HP, 6 Atk, 252 Def
Aerial Ace
Ice Fang
Earthquake
Feather Rest

Def Tank.

Blissey @ Leftovers
Bold (+Def, -Atk)
212HP, 252Def, 44SpAtk
Calm Mind
Ice Beam
Thunderbolt
Softboiled

Sp. Def Tank.

Threat List:

Tyranitar: Gengar, Gliscor, Milotic
Gyrados: Gengar, Garchomp
Inernape: Milotic, Garchomp
Azelf: Garchomp, Blissey, Weavile
Ryperior: Milotic, Maybe Gliscor…
Electrive: Gengar, Gliscor (if no Ice Punch), Garchomp (if no Ice Punch)
Heracross: Garchomp, Gengar
Salamance: Milotic, Weavile, Garchomp maybe, Gliscor maybe.
Togekiss: Gengar, Blissey, Milotic maybe
Gengar: Weavile
Garchomp: Milotic, Weavile, Garchomp maybe, Gliscor maybe.
Raikou: Garchomp (if no HP Ice), Gliscor (if no HP Ice), Maybe Gengar, Blissey
Lucario: Garchomp, Gliscor
Rampardos: Milotic, Garchomp, Gliscor
Tarous: Garchomp, Gliscor
Starmie: Blissey, Gengar maybe
Weavile: Maybe Gengar, Maybe Milotic
Dugtrio: Milotic, Gliscor, Garchomp, Weavile
Alakazam: Garchomp, Weavile, Blissey
Porygon-Z: Gengar, Garchomp
Medicham: Gengar, Garchomp maybe
Staraptor: Gengar, Milotic, Gliscor, Garchomp, Weavile
Slowbro: Blissey, Gengar
Jolteon: Garchomp (if no HP Ice), Gliscor (if No HP ice), Blissey, Gengar
Aerodactayl: Milotic, Gengar
Snorlax: Garchomp, Gengar, Weavile
Zapdos: Gengar, Gliscor (if no HP Ice), Garchomp (if no HP Ice)
Blissey: Garchomp, Weavile, Gengar, Gliscor maybe
Suicune: Gengar, Blissey
Sceptile: Garchomp, Blissey, Weavile
Slaking: Gengar, Garchomp, Gliscor, Weavile
Ninjask: Garcomp, Gengar, Milotic
Metagross: Gengar, Garchomp, Gliscor, Milotic
Celibi: Garchomp, Gengar
Jiachi: Garchomp, Gliscor, Gengar, Milotic
Manaphy: Gengar, Blissey

 

[Phuquoph]

Timid is preferable on Gengar. Magnifying Glass is only a 10% boost so Hypnosis, Thunder and Focus Blast will be only 77%.

Go with Stone Edge over Crunch on CB Garchomp since it'll do a lot to Gyarados, who is otherwise a decent counter to him. If you go with Outrage save it until mid to late game or you'll get locked in and taken down too easily. I tend to prefer Choice Scarf when using Outrage. Jolly nature for Choice Band, Adamant for Choice Scarf.

Watch out for Gyarados since it can OHKO Gengar after a Dragon Dance, although Blissey can survive and Thunderbolt it but won't enjoy switching in.

You've got some serious flaws in your threat list. Gengar is in no way a counter for Tyranitar, it will die to Crunch and Stone Edge in one hit. A counter has to be able to switch in. Go through your list again and ask yourself if the Pokemon you listed can safely switch in to what you think they can counter.