Postgame: Looking for Charlotte in Mirage Tower

[Drangofet]

I'm currently doing the level 135 Lugia & Ho-Oh legendary Pokémon side quest and I'm having trouble finding Charlotte. After talking to Laura at the ground level of the Mirage Tower she said Saphira is in the basement and Charlotte is up the tower. I found Saphira in the basement and Lugia but now I'm stuck looking for Charlotte. I went all the way up the tower, broke every piece of glass,  but couldn't find Charlotte anywhere.

[Tigerlittle9]

You gotta get to the end of the tower where the dive spots are where you did the manaphy quest, but instead of diving you go south through the white tiles and there’s an alternate version of the tower call “mirage tower?” Where you get honedge in e18