Play by Post PokéRadar v2

[Zorua3]

Ditto, as both can be found at the Lake of Outrage in Sword and Shield.

 

[Tsugumi Hazawa]

...Skarmory. Also appears in Mount Hokulani (Sun, Moon, Ultra Sun and Ultra Moon)

 

[awfulworldkid]

Heatran, which can be found in Reversal Mountain in Black 2/White 2.

 

[Dozing]

Grumpig, which can be found in the Rocky World of the Ultraspace Wilds in Ultra Sun and Ultra Moon.

 

[Ketsuba~n]

Wobbuffet, which is also in the Psychic Friend Safari in X & Y.

 

[SpatiallyRendering]

Magneton, which can also be found in Cerulean Cave in FRLG.

 

[BadgerDaddy]

Rotom, which can also be found in the Lost Hotel in X&Y

 

[Dozing]

Gastly, which can also be found in the Old Chateau in DPPt.

 

[Neosonic97]

Cubone, which can also be found in Pokemon Tower in RBY.

 

[MarkedInStone]

Happiny, who can also be found in Wela Volcano Park in Ultra Sun and Ultra Moon by SOS call from a Magby or Magmar.

 

[fractale]

my research shows that you can find happiny in thropy garden. the same can be said for eevee

 

[Dozing]

Zoroua, which can also be obtained in Castelia City.

 

[QuietGuardian]

Magnemite can also be found in the Trainers' School in USUM.

 

[OmegaAlphaDelta123]

Magmar, which can be found in the Fuego Ironworks in Platinum

 

[Tai-Wind]

koffing, which can be found in the basement of the burned tower in gold, silver, heartgold and soulsilver

 

[Argentum]

Chatot (HG/SS only) which can also be found in Azure Bay in X/Y

 

[JavierE64]

Dwebble, which can also be found in BW´s Desert Resort.

 

[fractale]

dwebble can be found as rock smash pokemon in route 12 of kalos. one pokemon that can be found in route 12 is pachirisu

 

[MarkedInStone]

Aegislash, found in the Royal Armory area in Pokemon Rumble World.

 

[OmegaAlphaDelta123]

Spiritomb, Found in Reverse Mountain of Pokemon Super Mystery Dungeon