I'm only gonna do fully evolved Pokemon here, so there won't be much to list here
this is a tiering for battling purposes, of course
(Gale Wings Fletchinder and Eviolite Doublade probably beat the worst fully evolved Pokemon, so lol)
Cover Legendary Tier
Xerneas
Yveltal
Top Tier
Aegislash
Goodra
Greninja
Talonflame
Zygarde
High Tier
Klefki
Noivern
Mid Tier
Low Tier
Carbink (maybe one up?)
Delphox
Gogoat
Bottom Tier
Dedenne
Slurpuff
(TBD)
Chesnaught
Diggersby
Vivillon
Pyroar
Florges
Pangoro
Furfrou
Meowstic
Aromatisse
Malamar
Barbaracle
Dragalge
Clawitzer
Tyrantrum
Aurorus
Sylveon
Hawlucha
Trevenant
Gourgeist
Avalugg
Heliolisk
discuss the rest for tiering positions