Lemme look up what it says 'bout her.

[does the thing with the pokedex.]

'pparently she's attracted by feelings of jealousy an' vindictiveness. An' lots of 'em will show up under the eaves of someone's house if they start feelin' really strongly 'bout vengeance. Probably makin' people's hearts race to see 'em. So maybe some kinda flower related to that?