The typings of the Paradox forms, not including Suicune/Virizion
What we know.
Donphan-Ground/
Donphan-Ground/
Volcarona-Bug/Fighting
Volcarona-Poison??/Fire (meaning it is one of the unknown types or something else)
Delibird-Ice/
Jigglypuff-Fairy/
Amoonguss-Grass/
Misdreavus-Ghost/Fairy
Hariyama-Fighting/
Gallade-Fighting/
Tyranitar-
Salamence-
Magneton?
Hydregion?
Meaning we know this many out of the types listed above:
0/4-Electric
3/5-Fighting
2/3-Fairy
0/3-Dragon
0/3-Dark
2/2-Ground
1/1-Ghost
1/1-Grass
1/1-Ice
1/1-Bug
1/1-Fire
3 unknown
My theories on final typings, going off the fact most retain at least one of their original typings and how fighting/electric match the legendaries and seem to be opposite to their version mascot's typings.
Donphan-Ground/Electric
Donphan-Ground/Fighting
Volcarona-Bug/Fighting
Volcarona-Poison??/Fire (meaning it is one of the unknown types or something else)
Delibird-Ice/
Jigglypuff-Fairy/Dark
Amoonguss-Grass/
Misdreavus-Ghost/Fairy
Hariyama-Fighting/
Gallade-Fighting/Fairy (combines secondary typings of Gardevoir/Gallade line)
Tyranitar-Dark/Fighting or Electric
Salamence-Dragon/Fighting or Electric
Magneton?-Electric/
Hydregion?-Dragon/
Meaning Violet Volcarona, Hydriegon, Magneton, Amoonguss and Delibird and Hariyama are unknown. However one Dark type is currently still avaible.
My money is that either Amoonguss, Hariyama or Delibird has it.
So maybe:
Amoonguss-Grass/Dark
Volcarona-Poison/Fire
Hydreigon-Dragon/Poison