I'm not necessarily the best player, but I also have all the mons, and currently building an elite army in preparation for EP19.
Togekiss @Razor Fang --> my Togekiss is a cold blooded killer, since this setup gives Air Slash something like 80% flinch rate, and it's nearly always bulky enough to get at least one Nasty Plot in.
Serene Grace
Bold Nature
- Aura Sphere
- Dazzling Gleam
- Air Slash
- Nasty Plot
Only skimmed the other comments, so I'm not sure if anybody recommended how to cover water types, and I didn't notice any grass or electric types in your roster. Here's my recommendations.
( It should be said that Whishcash, Lanturn, Seismitoad are annoying to deal with, and if you don't plan on using grass types often, you might want to invest in an Ice type like Alolan Ninetales w/ Snow Warning that knows Freeze Dry and Aurora Veil)
Rotom-W @Life Orb/Magnet
Levitate
Modest Nature
- Thunderbolt
- Hydro Pump
- Shadowball
- Substitute
Breloom @Toxic Orb
Poison Heal
Adamant/Jolly Nature
- Leech Seed/Spore
- Mach Punch
- Seedbomb
- Swords Dance
Electivire @Assault Vest/Choice Band/Muscle Band(what i use personally to keep the Thunder Wave) for some raw, unadulterated, physical POWER!!!!!!!!!!!!!!!!!
Motor Drive
Jolly Nature
- Thunder Punch
- Ice Punch
- Brick Break
- Thunder Wave/Rock Slide/Giga Impact (honestly up to you)