Goodra may be a combination of goo and dragon or Hydra. It may also be an inversion of Dragoon. It may also derive from good, referring to its kindly nature as opposed to the more violent dispositions of other pseudo-legendary Pokémon. Hisuian Goodra is tied with Registeel and Probopass for the highest base Special Defense stat of all Steel-type Pokémon. Able to freely control the hardness of its metallic shell. It loathes solitude and is extremely clingy—it will fume and run riot if those dearest to it ever leave its side.

In Hisui, Goodra has a dual-type Steel/ Dragon regional form. It evolves from Hisuian Sliggoo starting at level 50 during rain or fog in the overworld. It is the final form of Goomy in the Hisui region. Alternatively, it could be based on the yōkai called Shussebora, meaning "ascended trumpet shell", which is a trumpet shell snail that lives 1000 years in the mountains, 1000 on the plains, and 1000 at sea, then will ascend and turn into a dragon. Goodra evolves from Sliggoo starting at level 50 when leveled up during rain in the overworld. In Generation VII and VIII, Sliggoo will also evolve when leveled up during fog in the overworld. Rain instigated by Rain Dance, Drizzle, or Primordial Sea will not trigger Sliggoo's evolution. It is the final form of Goomy.In Hisui, Goodra has a dual-type Steel/ Dragon regional form. It evolves from Hisuian Sliggoo starting at level 50 during rain or fog in the overworld. It is the final form of Goomy in the Hisui region. All Goomy in Hisui will evolve into Hisuian Sliggoo regardless of their game of origin. It loves the rain. This mellow Pokémon can be seen walking around on the plains and in the mountains on rainy days.

Goodra is the first pseudo-legendary Pokémon to not be immune to any types through ordinary type match-ups. This is because its Ability Sap Sipper can give it an immunity to Grass-type moves. Prior to Generation IX, Goodra and its pre-evolved forms were the only known Pokémon that could have Gooey as an Ability. Hisuian Goodra and its pre-evolved forms are the only known Pokémon capable of learning the move Shelter.Goodra and its Hisuian form have the highest Special Defense stat and the highest single stat of all pseudo-legendary Pokémon, at base 150. I suspect the Goodra in the cave lives near water so it can moisten up its protective goo when it needs to. Goodra are very kindhearted and do their best to protect other Pokémon. In Hisui, Goodra has a regional form that evolves from Hisuian Sliggoo and is the final form of Goomy in the Hisui region. Hisuian Goodra is likely based on a snail. Its metallic shell in particular may be based on the scaly-foot gastropod, a species of deep-sea snail unique for its shell, which consists of iron sulfide compounds. Goodra is playable through obtaining a Unite License. It is a melee defender that starts as Goomy and evolves into Sliggoo at level 5, which evolves into Goodra at level 8.

Kalosian Goodra shares its category with the Horsea and Dratini evolutionary lines, along with Salamence. They are all known as the Dragon Pokémon. Goodra, due to its Dragon type, elongated body shape, and retractable tentacles used for battling is probably based on Lou Carcolh, a mythical serpent/mollusk creature from French folklore.Every one of Kalosian Goodra's base stats are exactly double those of Goomy, with Kalosian Sliggoo's being halfway in between (rounded up).