Since why not? I figure it might be useful to say who’s descended from a dragon since not all of them are from clans. (Just in case anyone doesn’t know – dragonbloods are a species of human who have dragon ancestry. They’re typically nobles and aristocrats and possess some draconic features and the ability to communicate with dragon pokemon, similar to Iris’ ability in the anime.) Note that this list will only include canon characters, not OCs/gijinkas/fankids/etc.

Kanto
Yellow Tokiwa – Daughter of a dragon god, so she’s technically a demigod. Her grandchildren will be regular dragonbloods though.

Johto
Clair Mikami – Clan head of Fusube-Mikami joint clans prior to being succeeded by Draco.
Crystal Mikami – Clair’s little sister in this AU. Member of Mikami clan.
Lance Fusube – Dual dragonblood, as the son of a dragon god and member of the Fusube clan. Technically a demigod, but his grandchildren will be regular dragonbloods.
Liza Fafnir – Member of the Fafnir clan, who are from a Scandinavian region but have strong ties in Kalos as well.

Hoenn
Lisia Lu – Member and heir of the Lu clan.
Wallace Lu – Member of Lu clan main family.
Winona Lu – Member of the Lu clan branch family.
Drake Lu – Former Lu clan head.
Zinnia Surgawi – Member of Draconid clan main family.

Sinnoh
Cynthia Drakonova – Head of Drakonov family.
Aaron Nikoyalev – No clan. Descendant of unknown Rotan dragon through his estranged father, Ghetsis.

Unova (It’s not called The Land of Dragons for nothing!)
Hilda Montfort – Member and heir of Montfort family, descendant of House Harmonia.
Hilbert Montfort – Member of Montfort family, descendant of House Harmonia.
Nate Montfort – 

Member of Montfort family, descendant of House Harmonia.

Rosa Montfort – 

Member of Montfort family, descendant of House Harmonia.

Grimsley Montfort – 

Member of Montfort family, descendant of House Harmonia.

Drayden Pendragon – Unova branch family head of House Pendragon.
Iris Pendragon – Member of main branch family of House Pendragon. Descendant of Ajagara clan.
Shannon Pendragon – Member of branch family of House Pendragon.
Benga Redwood – No clan. Descendant of unknown Galaran dragon through his father. 
Ghetsis Gropius – No clan. Descendant of unknown Rotan dragon.
N [Gropius] Montfort – No clan prior to marriage into Montfort family. Descendant of unknown Rotan dragon through Ghetsis.
Curtis [West] Montfort – No clan prior to marriage into Montfort family. Descendant of unknown Rotan dragon through Ghetsis.

Kalos
Calem Sycamore – No clan. Descendant of Fafnir clan through his estranged father.
Alain Sycamore – No clan. Descendant of Fafnir clan through his estranged father.
Drasna Fafnir – Member of Fafnir clan.
Titus Fafnir – Member of Fafnir.
Sawyer Sheng – No clan. Descendant of Draconid clan through his father (a former clan member).

Alola
None. This region used to be ruled by a dragonblood clan but they were killed in a coup centuries ago. The only ‘survivor’ is Ohia, who is a Faller from a world where this royal family were never killed off. There’s also Ryuki… but he’s an actual dragon and not a dragonblood so he doesn’t count.