So, I finally have nicknames for all the Pokémon I raised for non-competitive battles:
Emolga - Archfiend
Haxorus - Archblader
Seismitoad - DJ Toady
Klinklang - Wilhelm
Chandelure - Demise
Cryogonal - Frozstache
Beheeyem - Yuriko
Scolipede - Venee (curse you, lack of "é")
Swanna - Mr. Beaker
Jellicent - Mario
Emolga - Archfiend
Haxorus - Archblader
Seismitoad - DJ Toady
Klinklang - Wilhelm
Chandelure - Demise
Cryogonal - Frozstache
Beheeyem - Yuriko
Scolipede - Venee (curse you, lack of "é")
Swanna - Mr. Beaker
Jellicent - Mario