what do you think guys. have they any relation? their designs

>both blonde slender girls

Thats all anon.

>long blondish hair and some translucent elements in their outfit
>they must be related somehow!

No, Gamefreak just got lazy as fuck in their designs this gen.

>>26570336
wow, they're both girls! you're right anon, they sure do look alike.

>>26570478
except that this is actually her from platinum to becoming a leader in gen5

>>26570478
>in HeartGold, SoulSilver, and Platinum, Caitlin is the employer of Castle Valet Darach and oversees his Battle Castle battles. She is responsible for determining how many CP the player should receive depending on the outcome of the battle. She is said to be the most important person in the Battle Castle and acts like its princess.

>In Pokémon Black and White, Caitlin appears as a member of the Elite Four of Unova; she traveled to the region alone in order to develop her skills further. It is revealed that she possesses some sort of psychic powers, and that in the past, she had an explosive temper that would erupt if she lost a battle causing her psychic powers to cause a lot of damage. This may be the reason why Darach fought in her place in Generation IV. It may also explain why she was quite impatient, as she demanded that Darach give the player Castle Points "at once!" after each victory in the Battle Castle.

>She later appears in a villa that she is lending to Cynthia (gen5), as do the other female Gym Leaders and Elite Four members. She also mentions her time at the Battle Castle while in the villa.

What happens is that they're the best girls from their respective games, OP. Nothing else.